630561621064 has 8 divisors (see below), whose sum is σ = 1182303039510. Its totient is φ = 315280810528.

The previous prime is 630561621061. The next prime is 630561621073. The reversal of 630561621064 is 460126165036.

It can be written as a sum of positive squares in only one way, i.e., 511571118564 + 118990502500 = 715242^2 + 344950^2 .

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

It is a super-3 number, since 3×630561621064³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (630561621061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39410101309 + ... + 39410101324.

Almost surely, 2^630561621064 is an apocalyptic number.

It is an amenable number.

630561621064 is a deficient number, since it is larger than the sum of its proper divisors (551741418446).

630561621064 is a wasteful number, since it uses less digits than its factorization.

630561621064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78820202639 (or 78820202635 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 630561621064 in words is "six hundred thirty billion, five hundred sixty-one million, six hundred twenty-one thousand, sixty-four".