625642035661 has 4 divisors (see below), whose sum is σ = 626707865952. Its totient is φ = 624576205372.

The previous prime is 625642035653. The next prime is 625642035673. The reversal of 625642035661 is 166530246526.

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 625642035661 - 2³ = 625642035653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625642035691) 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, 532914265 + ... + 532915438.

It is an arithmetic number, because the mean of its divisors is an integer number (156676966488).

Almost surely, 2^625642035661 is an apocalyptic number.

It is an amenable number.

625642035661 is a deficient number, since it is larger than the sum of its proper divisors (1065830291).

625642035661 is a wasteful number, since it uses less digits than its factorization.

625642035661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065830290.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 625642035661 in words is "six hundred twenty-five billion, six hundred forty-two million, thirty-five thousand, six hundred sixty-one".