15856642545 has 8 divisors (see below), whose sum is σ = 25370628096. Its totient is φ = 8456876016.

The previous prime is 15856642519. The next prime is 15856642597. The reversal of 15856642545 is 54524665851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15856642545 - 2⁶ = 15856642481 is a prime.

It is a super-2 number, since 2×15856642545² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528554737 + ... + 528554766.

It is an arithmetic number, because the mean of its divisors is an integer number (3171328512).

Almost surely, 2^15856642545 is an apocalyptic number.

15856642545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15856642545 is a deficient number, since it is larger than the sum of its proper divisors (9513985551).

15856642545 is a wasteful number, since it uses less digits than its factorization.

15856642545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057109511.

The product of its digits is 5760000, while the sum is 51.

The spelling of 15856642545 in words is "fifteen billion, eight hundred fifty-six million, six hundred forty-two thousand, five hundred forty-five".