55777657 has 8 divisors (see below), whose sum is σ = 60285960. Its totient is φ = 51300480.

The previous prime is 55777651. The next prime is 55777661. The reversal of 55777657 is 75677755.

It can be written as a sum of positive squares in 4 ways, for example, as 3779136 + 51998521 = 1944^2 + 7211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55777657 - 2¹⁹ = 55253369 is a prime.

It is a super-2 number, since 2×55777657² = 6222294040819298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55777657.

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 7 ways as a sum of consecutive naturals, for example, 3982 + ... + 11287.

It is an arithmetic number, because the mean of its divisors is an integer number (7535745).

Almost surely, 2^55777657 is an apocalyptic number.

It is an amenable number.

55777657 is a deficient number, since it is larger than the sum of its proper divisors (4508303).

55777657 is a wasteful number, since it uses less digits than its factorization.

55777657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15563.

The product of its digits is 1800750, while the sum is 49.

The square root of 55777657 is about 7468.4440816009. Note that the first 3 decimals coincide. The cubic root of 55777657 is about 382.0792234469.

The spelling of 55777657 in words is "fifty-five million, seven hundred seventy-seven thousand, six hundred fifty-seven".