55887432993 has 144 divisors (see below), whose sum is σ = 101821224960. Its totient is φ = 29375704512.

The previous prime is 55887432983. The next prime is 55887433001. The reversal of 55887432993 is 39923478855.

55887432993 is a `hidden beast` number, since 5 + 588 + 7 + 43 + 2 + 9 + 9 + 3 = 666.

It is not a de Polignac number, because 55887432993 - 2⁴ = 55887432977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55887432993.

It is not an unprimeable number, because it can be changed into a prime (55887432973) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 28125546 + ... + 28127532.

It is an arithmetic number, because the mean of its divisors is an integer number (707091840).

Almost surely, 2^55887432993 is an apocalyptic number.

It is an amenable number.

55887432993 is a deficient number, since it is larger than the sum of its proper divisors (45933791967).

55887432993 is a wasteful number, since it uses less digits than its factorization.

55887432993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2126 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The spelling of 55887432993 in words is "fifty-five billion, eight hundred eighty-seven million, four hundred thirty-two thousand, nine hundred ninety-three".