630625661 has 6 divisors (see below), whose sum is σ = 659236830. Its totient is φ = 603206648.

The previous prime is 630625657. The next prime is 630625691. The reversal of 630625661 is 166526036.

It can be written as a sum of positive squares in only one way, i.e., 622752025 + 7873636 = 24955^2 + 2806^2 .

It is not a de Polignac number, because 630625661 - 2² = 630625657 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 (630625601) 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 5 ways as a sum of consecutive naturals, for example, 595526 + ... + 596583.

It is an arithmetic number, because the mean of its divisors is an integer number (109872805).

Almost surely, 2^630625661 is an apocalyptic number.

It is an amenable number.

630625661 is a deficient number, since it is larger than the sum of its proper divisors (28611169).

630625661 is a wasteful number, since it uses less digits than its factorization.

630625661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192155 (or 1192132 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 630625661 is about 25112.2611686005. The cubic root of 630625661 is about 857.5455802284.

The spelling of 630625661 in words is "six hundred thirty million, six hundred twenty-five thousand, six hundred sixty-one".