15661005115 has 32 divisors (see below), whose sum is σ = 23080840704. Its totient is φ = 9956390400.

The previous prime is 15661005089. The next prime is 15661005137. The reversal of 15661005115 is 51150016651.

It is not a de Polignac number, because 15661005115 - 2⁷ = 15661004987 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156561 + ... + 236290.

It is an arithmetic number, because the mean of its divisors is an integer number (721276272).

Almost surely, 2^15661005115 is an apocalyptic number.

15661005115 is a deficient number, since it is larger than the sum of its proper divisors (7419835589).

15661005115 is a wasteful number, since it uses less digits than its factorization.

15661005115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392947.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 15661005115 in words is "fifteen billion, six hundred sixty-one million, five thousand, one hundred fifteen".