625766161 has 2 divisors, whose sum is σ = 625766162. Its totient is φ = 625766160.

The previous prime is 625766123. The next prime is 625766179. The reversal of 625766161 is 161667526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531579136 + 94187025 = 23056^2 + 9705^2 .

It is a cyclic number.

It is not a de Polignac number, because 625766161 - 2⁷ = 625766033 is a prime.

It is not a weakly prime, because it can be changed into another prime (625766101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312883080 + 312883081.

It is an arithmetic number, because the mean of its divisors is an integer number (312883081).

Almost surely, 2^625766161 is an apocalyptic number.

It is an amenable number.

625766161 is a deficient number, since it is larger than the sum of its proper divisors (1).

625766161 is an equidigital number, since it uses as much as digits as its factorization.

625766161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 625766161 is about 25015.3185268547. The cubic root of 625766161 is about 855.3371951801.

The spelling of 625766161 in words is "six hundred twenty-five million, seven hundred sixty-six thousand, one hundred sixty-one".