55989191985 has 32 divisors (see below), whose sum is σ = 96004051200. Its totient is φ = 27790633728.

The previous prime is 55989191969. The next prime is 55989191989. The reversal of 55989191985 is 58919198955.

It is not a de Polignac number, because 55989191985 - 2⁴ = 55989191969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is not an unprimeable number, because it can be changed into a prime (55989191989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2180310 + ... + 2205839.

It is an arithmetic number, because the mean of its divisors is an integer number (3000126600).

Almost surely, 2^55989191985 is an apocalyptic number.

It is an amenable number.

55989191985 is a deficient number, since it is larger than the sum of its proper divisors (40014859215).

55989191985 is a wasteful number, since it uses less digits than its factorization.

55989191985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4386217.

The product of its digits is 52488000, while the sum is 69.

The spelling of 55989191985 in words is "fifty-five billion, nine hundred eighty-nine million, one hundred ninety-one thousand, nine hundred eighty-five".