625767561 has 6 divisors (see below), whose sum is σ = 903886490. Its totient is φ = 417178368.

The previous prime is 625767557. The next prime is 625767587. The reversal of 625767561 is 165767526.

625767561 is a `hidden beast` number, since 6 + 2 + 576 + 75 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 380250000 + 245517561 = 19500^2 + 15669^2 .

It is not a de Polignac number, because 625767561 - 2² = 625767557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (625767551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34764856 + ... + 34764873.

Almost surely, 2^625767561 is an apocalyptic number.

It is an amenable number.

625767561 is a deficient number, since it is larger than the sum of its proper divisors (278118929).

625767561 is a wasteful number, since it uses less digits than its factorization.

625767561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69529735 (or 69529732 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 625767561 is about 25015.3465096928. The cubic root of 625767561 is about 855.3378330495.

The spelling of 625767561 in words is "six hundred twenty-five million, seven hundred sixty-seven thousand, five hundred sixty-one".