625206664 has 8 divisors (see below), whose sum is σ = 1172262510. Its totient is φ = 312603328.

The previous prime is 625206661. The next prime is 625206689. The reversal of 625206664 is 466602526.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 446984164 + 178222500 = 21142^2 + 13350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (625206661) 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 as a sum of consecutive naturals, namely, 39075409 + ... + 39075424.

Almost surely, 2^625206664 is an apocalyptic number.

It is an amenable number.

625206664 is a deficient number, since it is larger than the sum of its proper divisors (547055846).

625206664 is a wasteful number, since it uses less digits than its factorization.

625206664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78150839 (or 78150835 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 625206664 is about 25004.1329383764. The cubic root of 625206664 is about 855.0822004117.

The spelling of 625206664 in words is "six hundred twenty-five million, two hundred six thousand, six hundred sixty-four".