651044340424 has 8 divisors (see below), whose sum is σ = 1220708138310. Its totient is φ = 325522170208.

The previous prime is 651044340409. The next prime is 651044340431. The reversal of 651044340424 is 424043440156.

It can be written as a sum of positive squares in only one way, i.e., 523582488100 + 127461852324 = 723590^2 + 357018^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40690271269 + ... + 40690271284.

Almost surely, 2^651044340424 is an apocalyptic number.

It is an amenable number.

651044340424 is a deficient number, since it is larger than the sum of its proper divisors (569663797886).

651044340424 is a wasteful number, since it uses less digits than its factorization.

651044340424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81380542559 (or 81380542555 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 37.

The spelling of 651044340424 in words is "six hundred fifty-one billion, forty-four million, three hundred forty thousand, four hundred twenty-four".