651944666072 has 32 divisors (see below), whose sum is σ = 1457764473600. Its totient is φ = 267256819104.

The previous prime is 651944666071. The next prime is 651944666081. The reversal of 651944666072 is 270666449156.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a junction number, because it is equal to n+sod(n) for n = 651944665999 and 651944666017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651944666071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253082822 + ... + 253085397.

It is an arithmetic number, because the mean of its divisors is an integer number (45555139800).

Almost surely, 2^651944666072 is an apocalyptic number.

It is an amenable number.

651944666072 is an abundant number, since it is smaller than the sum of its proper divisors (805819807528).

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

651944666072 is a wasteful number, since it uses less digits than its factorization.

651944666072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506168255 (or 506168251 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 56.

The spelling of 651944666072 in words is "six hundred fifty-one billion, nine hundred forty-four million, six hundred sixty-six thousand, seventy-two".