651255440664 has 32 divisors (see below), whose sum is σ = 1629553213440. Its totient is φ = 216896532000.

The previous prime is 651255440663. The next prime is 651255440699. The reversal of 651255440664 is 466044552156.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651255440663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11760232 + ... + 11815479.

It is an arithmetic number, because the mean of its divisors is an integer number (50923537920).

Almost surely, 2^651255440664 is an apocalyptic number.

It is an amenable number.

651255440664 is an abundant number, since it is smaller than the sum of its proper divisors (978297772776).

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

651255440664 is a wasteful number, since it uses less digits than its factorization.

651255440664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23576871 (or 23576867 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 651255440664 in words is "six hundred fifty-one billion, two hundred fifty-five million, four hundred forty thousand, six hundred sixty-four".