669258532864 has 96 divisors (see below), whose sum is σ = 1443645435960. Its totient is φ = 309001977856.

The previous prime is 669258532841. The next prime is 669258532867. The reversal of 669258532864 is 468235852966.

It can be written as a sum of positive squares in 4 ways, for example, as 633310372864 + 35948160000 = 795808^2 + 189600^2 .

It is a super-2 number, since 2×669258532864² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a junction number, because it is equal to n+sod(n) for n = 669258532796 and 669258532805.

It is not an unprimeable number, because it can be changed into a prime (669258532867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1663902 + ... + 2026594.

Almost surely, 2^669258532864 is an apocalyptic number.

669258532864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669258532864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721822717980).

669258532864 is an abundant number, since it is smaller than the sum of its proper divisors (774386903096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669258532864 is a wasteful number, since it uses less digits than its factorization.

669258532864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362785 (or 362765 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 64.

The spelling of 669258532864 in words is "six hundred sixty-nine billion, two hundred fifty-eight million, five hundred thirty-two thousand, eight hundred sixty-four".