630621655 has 4 divisors (see below), whose sum is σ = 756745992. Its totient is φ = 504497320.

The previous prime is 630621643. The next prime is 630621683. The reversal of 630621655 is 556126036.

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

It is not a de Polignac number, because 630621655 - 2⁷ = 630621527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 630621655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63062161 + ... + 63062170.

It is an arithmetic number, because the mean of its divisors is an integer number (189186498).

Almost surely, 2^630621655 is an apocalyptic number.

630621655 is a deficient number, since it is larger than the sum of its proper divisors (126124337).

630621655 is a wasteful number, since it uses less digits than its factorization.

630621655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126124336.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 630621655 is about 25112.1814066401. The cubic root of 630621655 is about 857.5437643942.

The spelling of 630621655 in words is "six hundred thirty million, six hundred twenty-one thousand, six hundred fifty-five".