55711556021 has 16 divisors (see below), whose sum is σ = 63983304000. Its totient is φ = 47975011200.

The previous prime is 55711556009. The next prime is 55711556071. The reversal of 55711556021 is 12065511755.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55711556021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55711556071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2402201 + ... + 2425281.

It is an arithmetic number, because the mean of its divisors is an integer number (3998956500).

Almost surely, 2^55711556021 is an apocalyptic number.

It is an amenable number.

55711556021 is a deficient number, since it is larger than the sum of its proper divisors (8271747979).

55711556021 is a wasteful number, since it uses less digits than its factorization.

55711556021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34660.

The product of its (nonzero) digits is 52500, while the sum is 38.

The spelling of 55711556021 in words is "fifty-five billion, seven hundred eleven million, five hundred fifty-six thousand, twenty-one".