55509977 has 2 divisors, whose sum is σ = 55509978. Its totient is φ = 55509976.

The previous prime is 55509931. The next prime is 55509989. The reversal of 55509977 is 77990555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54405376 + 1104601 = 7376^2 + 1051^2 .

It is a cyclic number.

It is not a de Polignac number, because 55509977 - 2¹⁸ = 55247833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55509907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27754988 + 27754989.

It is an arithmetic number, because the mean of its divisors is an integer number (27754989).

Almost surely, 2^55509977 is an apocalyptic number.

It is an amenable number.

55509977 is a deficient number, since it is larger than the sum of its proper divisors (1).

55509977 is an equidigital number, since it uses as much as digits as its factorization.

55509977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 496125, while the sum is 47.

The square root of 55509977 is about 7450.5017951813. The cubic root of 55509977 is about 381.4670367916.

The spelling of 55509977 in words is "fifty-five million, five hundred nine thousand, nine hundred seventy-seven".