55111100491 has 4 divisors (see below), whose sum is σ = 56045187000. Its totient is φ = 54177013984.

The previous prime is 55111100479. The next prime is 55111100537. The reversal of 55111100491 is 19400111155.

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

It is a cyclic number.

It is not a de Polignac number, because 55111100491 - 2⁵ = 55111100459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55111100411) 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, 467043166 + ... + 467043283.

It is an arithmetic number, because the mean of its divisors is an integer number (14011296750).

Almost surely, 2^55111100491 is an apocalyptic number.

55111100491 is a deficient number, since it is larger than the sum of its proper divisors (934086509).

55111100491 is an equidigital number, since it uses as much as digits as its factorization.

55111100491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934086508.

The product of its (nonzero) digits is 900, while the sum is 28.

The spelling of 55111100491 in words is "fifty-five billion, one hundred eleven million, one hundred thousand, four hundred ninety-one".