55100506160561 has 4 divisors (see below), whose sum is σ = 55168615563300. Its totient is φ = 55032396757824.

The previous prime is 55100506160549. The next prime is 55100506160587. The reversal of 55100506160561 is 16506160500155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35670756250000 + 19429749910561 = 5972500^2 + 4407919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55100506160561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55100506160521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34054700156 + ... + 34054701773.

It is an arithmetic number, because the mean of its divisors is an integer number (13792153890825).

Almost surely, 2^{55100506160561} is an apocalyptic number.

It is an amenable number.

55100506160561 is a deficient number, since it is larger than the sum of its proper divisors (68109402739).

55100506160561 is an equidigital number, since it uses as much as digits as its factorization.

55100506160561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68109402738.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 55100506160561 in words is "fifty-five trillion, one hundred billion, five hundred six million, one hundred sixty thousand, five hundred sixty-one".