55515100501561 has 24 divisors (see below), whose sum is σ = 61861420208000. Its totient is φ = 49669796940192.

The previous prime is 55515100501529. The next prime is 55515100501583. The reversal of 55515100501561 is 16510500151555.

It is a happy number.

It is not a de Polignac number, because 55515100501561 - 2⁵ = 55515100501529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55515100501061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34163826 + ... + 35751883.

Almost surely, 2^{55515100501561} is an apocalyptic number.

It is an amenable number.

55515100501561 is a deficient number, since it is larger than the sum of its proper divisors (6346319706439).

55515100501561 is a wasteful number, since it uses less digits than its factorization.

55515100501561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69915853 (or 69915830 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 40.

The spelling of 55515100501561 in words is "fifty-five trillion, five hundred fifteen billion, one hundred million, five hundred one thousand, five hundred sixty-one".