55545055661531 has 2 divisors, whose sum is σ = 55545055661532. Its totient is φ = 55545055661530.

The previous prime is 55545055661527. The next prime is 55545055661551. The reversal of 55545055661531 is 13516655054555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55545055661531 - 2² = 55545055661527 is a prime.

It is a super-2 number, since 2×55545055661531² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55545055661551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27772527830765 + 27772527830766.

It is an arithmetic number, because the mean of its divisors is an integer number (27772527830766).

Almost surely, 2^{55545055661531} is an apocalyptic number.

55545055661531 is a deficient number, since it is larger than the sum of its proper divisors (1).

55545055661531 is an equidigital number, since it uses as much as digits as its factorization.

55545055661531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33750000, while the sum is 56.

The spelling of 55545055661531 in words is "fifty-five trillion, five hundred forty-five billion, fifty-five million, six hundred sixty-one thousand, five hundred thirty-one".