55213878531 has 32 divisors (see below), whose sum is σ = 87135879168. Its totient is φ = 30444533280.

The previous prime is 55213878493. The next prime is 55213878547. The reversal of 55213878531 is 13587831255.

It is not a de Polignac number, because 55213878531 - 2¹⁴ = 55213862147 is a prime.

It is a super-2 number, since 2×55213878531² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55213878581) 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, 323875 + ... + 464028.

It is an arithmetic number, because the mean of its divisors is an integer number (2722996224).

Almost surely, 2^55213878531 is an apocalyptic number.

55213878531 is a deficient number, since it is larger than the sum of its proper divisors (31922000637).

55213878531 is a wasteful number, since it uses less digits than its factorization.

55213878531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788031.

The product of its digits is 1008000, while the sum is 48.

The spelling of 55213878531 in words is "fifty-five billion, two hundred thirteen million, eight hundred seventy-eight thousand, five hundred thirty-one".