55866855 has 32 divisors (see below), whose sum is σ = 100159488. Its totient is φ = 26352000.

The previous prime is 55866851. The next prime is 55866869.

55866855 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55866855 - 2² = 55866851 is a prime.

It is a super-2 number, since 2×55866855² = 6242210975182050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55866851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1530 + ... + 10680.

It is an arithmetic number, because the mean of its divisors is an integer number (3129984).

Almost surely, 2^55866855 is an apocalyptic number.

55866855 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55866855 is a deficient number, since it is larger than the sum of its proper divisors (44292633).

55866855 is a wasteful number, since it uses less digits than its factorization.

55866855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9207.

The product of its digits is 1440000, while the sum is 48.

The square root of 55866855 is about 7474.4133549062. The cubic root of 55866855 is about 382.2827849539.

The spelling of 55866855 in words is "fifty-five million, eight hundred sixty-six thousand, eight hundred fifty-five".