55771556 has 12 divisors (see below), whose sum is σ = 97666800. Its totient is φ = 27866760.

The previous prime is 55771523. The next prime is 55771571. The reversal of 55771556 is 65517755.

It is a super-2 number, since 2×55771556² = 6220932917322272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395 + ... + 11093.

It is an arithmetic number, because the mean of its divisors is an integer number (8138900).

Almost surely, 2^55771556 is an apocalyptic number.

It is an amenable number.

55771556 is a deficient number, since it is larger than the sum of its proper divisors (41895244).

55771556 is a wasteful number, since it uses less digits than its factorization.

55771556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9514 (or 9512 counting only the distinct ones).

The product of its digits is 183750, while the sum is 41.

The square root of 55771556 is about 7468.0356185546. The cubic root of 55771556 is about 382.0652922394.

The spelling of 55771556 in words is "fifty-five million, seven hundred seventy-one thousand, five hundred fifty-six".