15640064652531 has 16 divisors (see below), whose sum is σ = 22983712633728. Its totient is φ = 9381107193600.

The previous prime is 15640064652523. The next prime is 15640064652577. The reversal of 15640064652531 is 13525646004651.

It is a happy number.

It is not a de Polignac number, because 15640064652531 - 2³ = 15640064652523 is a prime.

It is a super-2 number, since 2×15640064652531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15640064652031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2442993465 + ... + 2442999866.

It is an arithmetic number, because the mean of its divisors is an integer number (1436482039608).

Almost surely, 2^{15640064652531} is an apocalyptic number.

15640064652531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15640064652531 is a deficient number, since it is larger than the sum of its proper divisors (7343647981197).

15640064652531 is a wasteful number, since it uses less digits than its factorization.

15640064652531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4885993442.

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 15640064652531 in words is "fifteen trillion, six hundred forty billion, sixty-four million, six hundred fifty-two thousand, five hundred thirty-one".