625808161 has 4 divisors (see below), whose sum is σ = 682699824. Its totient is φ = 568916500.

The previous prime is 625808159. The next prime is 625808177. The reversal of 625808161 is 161808526.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 625808161 - 2¹ = 625808159 is a prime.

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 625808161.

It is not an unprimeable number, because it can be changed into a prime (625808761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28445815 + ... + 28445836.

It is an arithmetic number, because the mean of its divisors is an integer number (170674956).

Almost surely, 2^625808161 is an apocalyptic number.

It is an amenable number.

625808161 is a deficient number, since it is larger than the sum of its proper divisors (56891663).

625808161 is a wasteful number, since it uses less digits than its factorization.

625808161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56891662.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 625808161 is about 25016.1579983818. The cubic root of 625808161 is about 855.3563308471.

The spelling of 625808161 in words is "six hundred twenty-five million, eight hundred eight thousand, one hundred sixty-one".