15661615055 has 16 divisors (see below), whose sum is σ = 19740962304. Its totient is φ = 11905159200.

The previous prime is 15661615049. The next prime is 15661615069. The reversal of 15661615055 is 55051616651.

It is not a de Polignac number, because 15661615055 - 2¹² = 15661610959 is a prime.

It is a super-2 number, since 2×15661615055² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433589 + ... + 468318.

It is an arithmetic number, because the mean of its divisors is an integer number (1233810144).

Almost surely, 2^15661615055 is an apocalyptic number.

15661615055 is a deficient number, since it is larger than the sum of its proper divisors (4079347249).

15661615055 is a wasteful number, since it uses less digits than its factorization.

15661615055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902086.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 15661615055 in words is "fifteen billion, six hundred sixty-one million, six hundred fifteen thousand, fifty-five".