669687078480 has 320 divisors, whose sum is σ = 2384641658880. Its totient is φ = 152297091072.

The previous prime is 669687078451. The next prime is 669687078481. The reversal of 669687078480 is 84870786966.

It is a super-2 number, since 2×669687078480² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669687078481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 320883997 + ... + 320886083.

It is an arithmetic number, because the mean of its divisors is an integer number (7452005184).

Almost surely, 2^669687078480 is an apocalyptic number.

669687078480 is a gapful number since it is divisible by the number (60) 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 669687078480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1192320829440).

669687078480 is an abundant number, since it is smaller than the sum of its proper divisors (1714954580400).

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

669687078480 is a wasteful number, since it uses less digits than its factorization.

669687078480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986 (or 2980 counting only the distinct ones).

The product of its (nonzero) digits is 195084288, while the sum is 69.

The spelling of 669687078480 in words is "six hundred sixty-nine billion, six hundred eighty-seven million, seventy-eight thousand, four hundred eighty".