55581571916 has 48 divisors (see below), whose sum is σ = 106639092000. Its totient is φ = 25194250752.

The previous prime is 55581571847. The next prime is 55581571921. The reversal of 55581571916 is 61917518555.

It is a super-2 number, since 2×55581571916² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649271 + ... + 729873.

It is an arithmetic number, because the mean of its divisors is an integer number (2221647750).

Almost surely, 2^55581571916 is an apocalyptic number.

It is an amenable number.

55581571916 is a deficient number, since it is larger than the sum of its proper divisors (51057520084).

55581571916 is a wasteful number, since it uses less digits than its factorization.

55581571916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80858 (or 80856 counting only the distinct ones).

The product of its digits is 1890000, while the sum is 53.

The spelling of 55581571916 in words is "fifty-five billion, five hundred eighty-one million, five hundred seventy-one thousand, nine hundred sixteen".