651736656 has 120 divisors (see below), whose sum is σ = 1901128320. Its totient is φ = 208243200.

The previous prime is 651736643. The next prime is 651736669. The reversal of 651736656 is 656637156.

It is an interprime number because it is at equal distance from previous prime (651736643) and next prime (651736669).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347401 + ... + 349271.

It is an arithmetic number, because the mean of its divisors is an integer number (15842736).

Almost surely, 2^651736656 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 651736656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950564160).

651736656 is an abundant number, since it is smaller than the sum of its proper divisors (1249391664).

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

651736656 is a wasteful number, since it uses less digits than its factorization.

651736656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985 (or 1976 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The square root of 651736656 is about 25529.1334753062. The cubic root of 651736656 is about 867.0098856246.

The spelling of 651736656 in words is "six hundred fifty-one million, seven hundred thirty-six thousand, six hundred fifty-six".