669146031720 has 160 divisors (see below), whose sum is σ = 2303930086920. Its totient is φ = 174086737920.

The previous prime is 669146031689. The next prime is 669146031737. The reversal of 669146031720 is 27130641966.

669146031720 is a `hidden beast` number, since 6 + 6 + 9 + 1 + 4 + 603 + 17 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 330470917956 + 338675113764 = 574866^2 + 581958^2 .

It is a super-3 number, since 3×669146031720³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2385777 + ... + 2651456.

Almost surely, 2^669146031720 is an apocalyptic number.

669146031720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669146031720 is an abundant number, since it is smaller than the sum of its proper divisors (1634784055200).

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

669146031720 is a wasteful number, since it uses less digits than its factorization.

669146031720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5037297 (or 5037284 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 669146031720 in words is "six hundred sixty-nine billion, one hundred forty-six million, thirty-one thousand, seven hundred twenty".