55491393776 has 120 divisors (see below), whose sum is σ = 135550386720. Its totient is φ = 21812184576.

The previous prime is 55491393757. The next prime is 55491393781. The reversal of 55491393776 is 67739319455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1582805 + ... + 1617483.

It is an arithmetic number, because the mean of its divisors is an integer number (1129586556).

Almost surely, 2^55491393776 is an apocalyptic number.

55491393776 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55491393776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67775193360).

55491393776 is an abundant number, since it is smaller than the sum of its proper divisors (80058992944).

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

55491393776 is a wasteful number, since it uses less digits than its factorization.

55491393776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34871 (or 34858 counting only the distinct ones).

The product of its digits is 21432600, while the sum is 59.

The spelling of 55491393776 in words is "fifty-five billion, four hundred ninety-one million, three hundred ninety-three thousand, seven hundred seventy-six".