651659994 has 24 divisors (see below), whose sum is σ = 1417433940. Its totient is φ = 216373248.

The previous prime is 651659923. The next prime is 651660001. The reversal of 651659994 is 499956156.

It can be written as a sum of positive squares in 2 ways, for example, as 471107025 + 180552969 = 21705^2 + 13437^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 651659994.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 65809 + ... + 75060.

Almost surely, 2^651659994 is an apocalyptic number.

651659994 is an abundant number, since it is smaller than the sum of its proper divisors (765773946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651659994 is a wasteful number, since it uses less digits than its factorization.

651659994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141134 (or 141131 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 54.

The square root of 651659994 is about 25527.6319700829. The cubic root of 651659994 is about 866.9758896246.

It can be divided in two parts, 651659 and 994, that added together give a triangular number (652653 = T₁₁₄₂).

The spelling of 651659994 in words is "six hundred fifty-one million, six hundred fifty-nine thousand, nine hundred ninety-four".