55561620216 has 32 divisors (see below), whose sum is σ = 138917394000. Its totient is φ = 18518760960.

The previous prime is 55561620197. The next prime is 55561620223. The reversal of 55561620216 is 61202616555.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157056 + ... + 368496.

Almost surely, 2^55561620216 is an apocalyptic number.

It is an amenable number.

55561620216 is an abundant number, since it is smaller than the sum of its proper divisors (83355773784).

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

55561620216 is a wasteful number, since it uses less digits than its factorization.

55561620216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222399 (or 222395 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 55561620216 in words is "fifty-five billion, five hundred sixty-one million, six hundred twenty thousand, two hundred sixteen".