651901664 has 12 divisors (see below), whose sum is σ = 1283431464. Its totient is φ = 325950816.

The previous prime is 651901661. The next prime is 651901667. The reversal of 651901664 is 466109156.

It is an interprime number because it is at equal distance from previous prime (651901661) and next prime (651901667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651901661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10185932 + ... + 10185995.

It is an arithmetic number, because the mean of its divisors is an integer number (106952622).

Almost surely, 2^651901664 is an apocalyptic number.

It is an amenable number.

651901664 is a deficient number, since it is larger than the sum of its proper divisors (631529800).

651901664 is a wasteful number, since it uses less digits than its factorization.

651901664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20371937 (or 20371929 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 651901664 is about 25532.3650295072. The cubic root of 651901664 is about 867.0830498870.

The spelling of 651901664 in words is "six hundred fifty-one million, nine hundred one thousand, six hundred sixty-four".