55777577 has 4 divisors (see below), whose sum is σ = 56449680. Its totient is φ = 55105476.

The previous prime is 55777549. The next prime is 55777609. The reversal of 55777577 is 77577755.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55777577 - 2²⁴ = 39000361 is a prime.

It is a super-2 number, since 2×55777577² = 6222276191981858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55777517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335927 + ... + 336092.

It is an arithmetic number, because the mean of its divisors is an integer number (14112420).

Almost surely, 2^55777577 is an apocalyptic number.

It is an amenable number.

55777577 is a deficient number, since it is larger than the sum of its proper divisors (672103).

55777577 is an equidigital number, since it uses as much as digits as its factorization.

55777577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672102.

The product of its digits is 2100875, while the sum is 50.

The square root of 55777577 is about 7468.4387257311. The cubic root of 55777577 is about 382.0790407791.

The spelling of 55777577 in words is "fifty-five million, seven hundred seventy-seven thousand, five hundred seventy-seven".