55715199891 has 24 divisors (see below), whose sum is σ = 80519063040. Its totient is φ = 34252953696.

The previous prime is 55715199887. The next prime is 55715199893. The reversal of 55715199891 is 19899151755.

It is not a de Polignac number, because 55715199891 - 2² = 55715199887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55715199893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 473890 + ... + 579656.

It is an arithmetic number, because the mean of its divisors is an integer number (3354960960).

Almost surely, 2^55715199891 is an apocalyptic number.

55715199891 is a deficient number, since it is larger than the sum of its proper divisors (24803863149).

55715199891 is a wasteful number, since it uses less digits than its factorization.

55715199891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106835 (or 106822 counting only the distinct ones).

The product of its digits is 5103000, while the sum is 60.

The spelling of 55715199891 in words is "fifty-five billion, seven hundred fifteen million, one hundred ninety-nine thousand, eight hundred ninety-one".