55777691 has 4 divisors (see below), whose sum is σ = 58202832. Its totient is φ = 53352552.

The previous prime is 55777681. The next prime is 55777723. The reversal of 55777691 is 19677755.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55777691 - 2⁶ = 55777627 is a prime.

It is a super-2 number, since 2×55777691² = 6222301626582962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55777651) 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, 1212536 + ... + 1212581.

It is an arithmetic number, because the mean of its divisors is an integer number (14550708).

Almost surely, 2^55777691 is an apocalyptic number.

55777691 is a deficient number, since it is larger than the sum of its proper divisors (2425141).

55777691 is a wasteful number, since it uses less digits than its factorization.

55777691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425140.

The product of its digits is 463050, while the sum is 47.

The square root of 55777691 is about 7468.4463578444. The cubic root of 55777691 is about 382.0793010807.

The spelling of 55777691 in words is "fifty-five million, seven hundred seventy-seven thousand, six hundred ninety-one".