625551660616 has 64 divisors (see below), whose sum is σ = 1234938927600. Its totient is φ = 296771481600.

The previous prime is 625551660611. The next prime is 625551660623. The reversal of 625551660616 is 616066155526.

It can be written as a sum of positive squares in 8 ways, for example, as 50917922500 + 574633738116 = 225650^2 + 758046^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 625551660616.

It is not an unprimeable number, because it can be changed into a prime (625551660611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1605066 + ... + 1956358.

Almost surely, 2^625551660616 is an apocalyptic number.

It is an amenable number.

625551660616 is a deficient number, since it is larger than the sum of its proper divisors (609387266984).

625551660616 is a wasteful number, since it uses less digits than its factorization.

625551660616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351490 (or 351486 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 49.

The spelling of 625551660616 in words is "six hundred twenty-five billion, five hundred fifty-one million, six hundred sixty thousand, six hundred sixteen".