55775556 has 18 divisors (see below), whose sum is σ = 140988302. Its totient is φ = 18591840.

The previous prime is 55775549. The next prime is 55775561. The reversal of 55775556 is 65557755.

It can be written as a sum of positive squares in only one way, i.e., 48024900 + 7750656 = 6930^2 + 2784^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×55775556² = 6221825294218272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 774625 + ... + 774696.

Almost surely, 2^55775556 is an apocalyptic number.

It is an amenable number.

55775556 is an abundant number, since it is smaller than the sum of its proper divisors (85212746).

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

55775556 is a wasteful number, since it uses less digits than its factorization.

55775556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549331 (or 1549326 counting only the distinct ones).

The product of its digits is 918750, while the sum is 45.

The square root of 55775556 is about 7468.3034217953. The cubic root of 55775556 is about 382.0744260748.

The spelling of 55775556 in words is "fifty-five million, seven hundred seventy-five thousand, five hundred fifty-six".