651615500661 has 16 divisors (see below), whose sum is σ = 870565449600. Its totient is φ = 433538819840.

The previous prime is 651615500633. The next prime is 651615500663. The reversal of 651615500661 is 166005516156.

It is a cyclic number.

It is not a de Polignac number, because 651615500661 - 2¹¹ = 651615498613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651615500663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2890456 + ... + 3107726.

It is an arithmetic number, because the mean of its divisors is an integer number (54410340600).

Almost surely, 2^651615500661 is an apocalyptic number.

It is an amenable number.

651615500661 is a deficient number, since it is larger than the sum of its proper divisors (218949948939).

651615500661 is a wasteful number, since it uses less digits than its factorization.

651615500661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219276.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 651615500661 in words is "six hundred fifty-one billion, six hundred fifteen million, five hundred thousand, six hundred sixty-one".