15696149540 has 12 divisors (see below), whose sum is σ = 32961914076. Its totient is φ = 6278459808.

The previous prime is 15696149501. The next prime is 15696149549. The reversal of 15696149540 is 4594169651.

It can be written as a sum of positive squares in 2 ways, for example, as 4386677824 + 11309471716 = 66232^2 + 106346^2 .

It is a super-2 number, since 2×15696149540² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15696149549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392403719 + ... + 392403758.

It is an arithmetic number, because the mean of its divisors is an integer number (2746826173).

Almost surely, 2^15696149540 is an apocalyptic number.

15696149540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15696149540 is an abundant number, since it is smaller than the sum of its proper divisors (17265764536).

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

15696149540 is a wasteful number, since it uses less digits than its factorization.

15696149540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784807486 (or 784807484 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 15696149540 in words is "fifteen billion, six hundred ninety-six million, one hundred forty-nine thousand, five hundred forty".