651511055664 has 120 divisors (see below), whose sum is σ = 2085704318880. Its totient is φ = 185976013824.

The previous prime is 651511055641. The next prime is 651511055681. The reversal of 651511055664 is 466550115156.

651511055664 is a `hidden beast` number, since 65 + 15 + 1 + 10 + 5 + 566 + 4 = 666.

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, 811182 + ... + 1400370.

It is an arithmetic number, because the mean of its divisors is an integer number (17380869324).

Almost surely, 2^651511055664 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 651511055664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1042852159440).

651511055664 is an abundant number, since it is smaller than the sum of its proper divisors (1434193263216).

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

651511055664 is a wasteful number, since it uses less digits than its factorization.

651511055664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590307 (or 590298 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 651511055664 in words is "six hundred fifty-one billion, five hundred eleven million, fifty-five thousand, six hundred sixty-four".