55775557 has 16 divisors (see below), whose sum is σ = 58605120. Its totient is φ = 53044992.

The previous prime is 55775549. The next prime is 55775561. The reversal of 55775557 is 75557755.

It is a cyclic number.

It is not a de Polignac number, because 55775557 - 2³ = 55775549 is a prime.

It is a super-2 number, since 2×55775557² = 6221825517320498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55775527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401194 + ... + 401332.

It is an arithmetic number, because the mean of its divisors is an integer number (3662820).

Almost surely, 2^55775557 is an apocalyptic number.

It is an amenable number.

55775557 is a deficient number, since it is larger than the sum of its proper divisors (2829563).

55775557 is a wasteful number, since it uses less digits than its factorization.

55775557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372.

The product of its digits is 1071875, while the sum is 46.

The square root of 55775557 is about 7468.3034887450. The cubic root of 55775557 is about 382.0744283582.

The spelling of 55775557 in words is "fifty-five million, seven hundred seventy-five thousand, five hundred fifty-seven".