651764637242 has 8 divisors (see below), whose sum is σ = 1004069846676. Its totient is φ = 317074688352.

The previous prime is 651764637217. The next prime is 651764637283. The reversal of 651764637242 is 242736467156.

It can be written as a sum of positive squares in 2 ways, for example, as 636706647721 + 15057989521 = 797939^2 + 122711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4403815043 + ... + 4403815190.

Almost surely, 2^651764637242 is an apocalyptic number.

651764637242 is a deficient number, since it is larger than the sum of its proper divisors (352305209434).

651764637242 is a wasteful number, since it uses less digits than its factorization.

651764637242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8807630272.

The product of its digits is 10160640, while the sum is 53.

The spelling of 651764637242 in words is "six hundred fifty-one billion, seven hundred sixty-four million, six hundred thirty-seven thousand, two hundred forty-two".