55199231985 has 32 divisors (see below), whose sum is σ = 89001335808. Its totient is φ = 29212643520.

The previous prime is 55199231947. The next prime is 55199232019. The reversal of 55199231985 is 58913299155.

It is a happy number.

It is not a de Polignac number, because 55199231985 - 2⁸ = 55199231729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1554580 + ... + 1589690.

It is an arithmetic number, because the mean of its divisors is an integer number (2781291744).

Almost surely, 2^55199231985 is an apocalyptic number.

It is an amenable number.

55199231985 is a deficient number, since it is larger than the sum of its proper divisors (33802103823).

55199231985 is a wasteful number, since it uses less digits than its factorization.

55199231985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35925.

The product of its digits is 4374000, while the sum is 57.

The spelling of 55199231985 in words is "fifty-five billion, one hundred ninety-nine million, two hundred thirty-one thousand, nine hundred eighty-five".