55603618831 has 4 divisors (see below), whose sum is σ = 56386768464. Its totient is φ = 54820469200.

The previous prime is 55603618817. The next prime is 55603618849. The reversal of 55603618831 is 13881630655.

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 55603618831 - 2¹³ = 55603610639 is a prime.

It is a super-2 number, since 2×55603618831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55603618871) 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, 391574710 + ... + 391574851.

It is an arithmetic number, because the mean of its divisors is an integer number (14096692116).

Almost surely, 2^55603618831 is an apocalyptic number.

55603618831 is a deficient number, since it is larger than the sum of its proper divisors (783149633).

55603618831 is an equidigital number, since it uses as much as digits as its factorization.

55603618831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783149632.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 55603618831 in words is "fifty-five billion, six hundred three million, six hundred eighteen thousand, eight hundred thirty-one".