15961222615 has 32 divisors (see below), whose sum is σ = 21378994560. Its totient is φ = 11362788864.

The previous prime is 15961222609. The next prime is 15961222649. The reversal of 15961222615 is 51622216951.

It is a cyclic number.

It is not a de Polignac number, because 15961222615 - 2¹¹ = 15961220567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231702 + ... + 292588.

It is an arithmetic number, because the mean of its divisors is an integer number (668093580).

Almost surely, 2^15961222615 is an apocalyptic number.

15961222615 is a deficient number, since it is larger than the sum of its proper divisors (5417771945).

15961222615 is a wasteful number, since it uses less digits than its factorization.

15961222615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61051.

The product of its digits is 64800, while the sum is 40.

The spelling of 15961222615 in words is "fifteen billion, nine hundred sixty-one million, two hundred twenty-two thousand, six hundred fifteen".