15688312641 has 12 divisors (see below), whose sum is σ = 22669576020. Its totient is φ = 10454868960.

The previous prime is 15688312609. The next prime is 15688312649. The reversal of 15688312641 is 14621388651.

15688312641 is a `hidden beast` number, since 1 + 568 + 83 + 1 + 2 + 6 + 4 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4888946241 + 10799366400 = 69921^2 + 103920^2 .

It is not a de Polignac number, because 15688312641 - 2⁵ = 15688312609 is a prime.

It is a super-2 number, since 2×15688312641² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15688312649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308946 + ... + 356123.

It is an arithmetic number, because the mean of its divisors is an integer number (1889131335).

Almost surely, 2^15688312641 is an apocalyptic number.

It is an amenable number.

15688312641 is a deficient number, since it is larger than the sum of its proper divisors (6981263379).

15688312641 is a wasteful number, since it uses less digits than its factorization.

15688312641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667696 (or 667693 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

It can be divided in two parts, 15688 and 312641, that added together give a square (328329 = 573²).

The spelling of 15688312641 in words is "fifteen billion, six hundred eighty-eight million, three hundred twelve thousand, six hundred forty-one".