651605653321 has 32 divisors (see below), whose sum is σ = 791182556928. Its totient is φ = 523878236160.

The previous prime is 651605653297. The next prime is 651605653331. The reversal of 651605653321 is 123356506156.

It is a cyclic number.

It is not a de Polignac number, because 651605653321 - 2⁵ = 651605653289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651605653331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42937491 + ... + 42952663.

It is an arithmetic number, because the mean of its divisors is an integer number (24724454904).

Almost surely, 2^651605653321 is an apocalyptic number.

It is an amenable number.

651605653321 is a deficient number, since it is larger than the sum of its proper divisors (139576903607).

651605653321 is a wasteful number, since it uses less digits than its factorization.

651605653321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16401.

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 651605653321 in words is "six hundred fifty-one billion, six hundred five million, six hundred fifty-three thousand, three hundred twenty-one".