625748561 has 4 divisors (see below), whose sum is σ = 626769972. Its totient is φ = 624727152.

The previous prime is 625748521. The next prime is 625748593. The reversal of 625748561 is 165847526.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 219484225 + 406264336 = 14815^2 + 20156^2 .

It is a cyclic number.

It is not a de Polignac number, because 625748561 - 2¹⁸ = 625486417 is a prime.

It is a super-2 number, since 2×625748561² = 783122523187141442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625748521) 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, 509786 + ... + 511011.

It is an arithmetic number, because the mean of its divisors is an integer number (156692493).

Almost surely, 2^625748561 is an apocalyptic number.

It is an amenable number.

625748561 is a deficient number, since it is larger than the sum of its proper divisors (1021411).

625748561 is a wasteful number, since it uses less digits than its factorization.

625748561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021410.

The product of its digits is 403200, while the sum is 44.

The square root of 625748561 is about 25014.9667399339. The cubic root of 625748561 is about 855.3291761699.

The spelling of 625748561 in words is "six hundred twenty-five million, seven hundred forty-eight thousand, five hundred sixty-one".