55511556 has 24 divisors (see below), whose sum is σ = 129724224. Its totient is φ = 18475680.

The previous prime is 55511543. The next prime is 55511557. The reversal of 55511556 is 65511555.

It is a super-2 number, since 2×55511556² = 6163065699082272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55511557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5641 + ... + 11951.

It is an arithmetic number, because the mean of its divisors is an integer number (5405176).

Almost surely, 2^55511556 is an apocalyptic number.

It is an amenable number.

55511556 is an abundant number, since it is smaller than the sum of its proper divisors (74212668).

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

55511556 is a wasteful number, since it uses less digits than its factorization.

55511556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7051 (or 7049 counting only the distinct ones).

The product of its digits is 18750, while the sum is 33.

The square root of 55511556 is about 7450.6077604448. The cubic root of 55511556 is about 381.4706537435.

Subtracting 55511556 from its reverse (65511555), we obtain a palindrome (9999999).

The spelling of 55511556 in words is "fifty-five million, five hundred eleven thousand, five hundred fifty-six".