55631664426 has 64 divisors (see below), whose sum is σ = 123184285056. Its totient is φ = 16638048000.

The previous prime is 55631664419. The next prime is 55631664521. The reversal of 55631664426 is 62446613655.

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, 3024016 + ... + 3042356.

It is an arithmetic number, because the mean of its divisors is an integer number (1924754454).

Almost surely, 2^55631664426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55631664426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61592142528).

55631664426 is an abundant number, since it is smaller than the sum of its proper divisors (67552620630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55631664426 is a wasteful number, since it uses less digits than its factorization.

55631664426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19447.

The product of its digits is 3110400, while the sum is 48.

The spelling of 55631664426 in words is "fifty-five billion, six hundred thirty-one million, six hundred sixty-four thousand, four hundred twenty-six".