651163968 has 448 divisors, whose sum is σ = 2437424640. Its totient is φ = 165888000.

The previous prime is 651163957. The next prime is 651164011. The reversal of 651163968 is 869361156.

651163968 is a `hidden beast` number, since 6 + 5 + 1 + 1 + 639 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6447118 + ... + 6447218.

It is an arithmetic number, because the mean of its divisors is an integer number (5440680).

Almost surely, 2^651163968 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 651163968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1218712320).

651163968 is an abundant number, since it is smaller than the sum of its proper divisors (1786260672).

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

651163968 is a wasteful number, since it uses less digits than its factorization.

651163968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 167 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 651163968 is about 25517.9146483407. The cubic root of 651163968 is about 866.7558609056.

The spelling of 651163968 in words is "six hundred fifty-one million, one hundred sixty-three thousand, nine hundred sixty-eight".