65555257 has 2 divisors, whose sum is σ = 65555258. Its totient is φ = 65555256.

The previous prime is 65555209. The next prime is 65555261. The reversal of 65555257 is 75255556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64336441 + 1218816 = 8021^2 + 1104^2 .

It is a cyclic number.

It is not a de Polignac number, because 65555257 - 2¹⁵ = 65522489 is a prime.

It is not a weakly prime, because it can be changed into another prime (65555057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32777628 + 32777629.

It is an arithmetic number, because the mean of its divisors is an integer number (32777629).

Almost surely, 2^65555257 is an apocalyptic number.

It is an amenable number.

65555257 is a deficient number, since it is larger than the sum of its proper divisors (1).

65555257 is an equidigital number, since it uses as much as digits as its factorization.

65555257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262500, while the sum is 40.

The square root of 65555257 is about 8096.6200972999. The cubic root of 65555257 is about 403.2142215192.

The spelling of 65555257 in words is "sixty-five million, five hundred fifty-five thousand, two hundred fifty-seven".