15561773672312 has 64 divisors (see below), whose sum is σ = 34466476907520. Its totient is φ = 6448787065728.

The previous prime is 15561773672257. The next prime is 15561773672323. The reversal of 15561773672312 is 21327637716551.

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 35399183 + ... + 35836094.

It is an arithmetic number, because the mean of its divisors is an integer number (538538701680).

Almost surely, 2^{15561773672312} is an apocalyptic number.

It is an amenable number.

15561773672312 is an abundant number, since it is smaller than the sum of its proper divisors (18904703235208).

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

15561773672312 is a wasteful number, since it uses less digits than its factorization.

15561773672312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71235420 (or 71235416 counting only the distinct ones).

The product of its digits is 11113200, while the sum is 56.

The spelling of 15561773672312 in words is "fifteen trillion, five hundred sixty-one billion, seven hundred seventy-three million, six hundred seventy-two thousand, three hundred twelve".