15640064523 has 8 divisors (see below), whose sum is σ = 23170466000. Its totient is φ = 10426709664.

The previous prime is 15640064513. The next prime is 15640064543. The reversal of 15640064523 is 32546004651.

15640064523 is a `hidden beast` number, since 1 + 5 + 6 + 4 + 0 + 0 + 645 + 2 + 3 = 666.

It is not a de Polignac number, because 15640064523 - 2⁶ = 15640064459 is a prime.

It is a super-2 number, since 2×15640064523² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15640064513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289630798 + ... + 289630851.

It is an arithmetic number, because the mean of its divisors is an integer number (2896308250).

Almost surely, 2^15640064523 is an apocalyptic number.

15640064523 is a deficient number, since it is larger than the sum of its proper divisors (7530401477).

15640064523 is an equidigital number, since it uses as much as digits as its factorization.

15640064523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579261658 (or 579261652 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 15640064523 in words is "fifteen billion, six hundred forty million, sixty-four thousand, five hundred twenty-three".