15616069668 has 72 divisors (see below), whose sum is σ = 40660836216. Its totient is φ = 5050252800.

The previous prime is 15616069649. The next prime is 15616069697. The reversal of 15616069668 is 86696061651.

15616069668 is a `hidden beast` number, since 15 + 616 + 0 + 6 + 9 + 6 + 6 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4252083264 + 11363986404 = 65208^2 + 106602^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 237930 + ... + 296382.

Almost surely, 2^15616069668 is an apocalyptic number.

15616069668 is a gapful number since it is divisible by the number (18) 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 15616069668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20330418108).

15616069668 is an abundant number, since it is smaller than the sum of its proper divisors (25044766548).

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

15616069668 is a wasteful number, since it uses less digits than its factorization.

15616069668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58685 (or 58680 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 15616069668 in words is "fifteen billion, six hundred sixteen million, sixty-nine thousand, six hundred sixty-eight".