77557057 has 2 divisors, whose sum is σ = 77557058. Its totient is φ = 77557056.

The previous prime is 77557027. The next prime is 77557061. The reversal of 77557057 is 75075577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68046001 + 9511056 = 8249^2 + 3084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77557057 is a prime.

It is not a weakly prime, because it can be changed into another prime (77557027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38778528 + 38778529.

It is an arithmetic number, because the mean of its divisors is an integer number (38778529).

Almost surely, 2^77557057 is an apocalyptic number.

It is an amenable number.

77557057 is a deficient number, since it is larger than the sum of its proper divisors (1).

77557057 is an equidigital number, since it uses as much as digits as its factorization.

77557057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300125, while the sum is 43.

The square root of 77557057 is about 8806.6484544349. The cubic root of 77557057 is about 426.4555527715.

The spelling of 77557057 in words is "seventy-seven million, five hundred fifty-seven thousand, fifty-seven".