651640722264 has 192 divisors, whose sum is σ = 2136186561600. Its totient is φ = 175185395712.

The previous prime is 651640722259. The next prime is 651640722277. The reversal of 651640722264 is 462227046156.

651640722264 is a `hidden beast` number, since 6 + 5 + 16 + 407 + 2 + 226 + 4 = 666.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 44452024 + ... + 44466680.

It is an arithmetic number, because the mean of its divisors is an integer number (11125971675).

Almost surely, 2^651640722264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651640722264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1068093280800).

651640722264 is an abundant number, since it is smaller than the sum of its proper divisors (1484545839336).

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

651640722264 is a wasteful number, since it uses less digits than its factorization.

651640722264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19882 (or 19875 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The spelling of 651640722264 in words is "six hundred fifty-one billion, six hundred forty million, seven hundred twenty-two thousand, two hundred sixty-four".