651106500521 has 2 divisors, whose sum is σ = 651106500522. Its totient is φ = 651106500520.

The previous prime is 651106500493. The next prime is 651106500559. The reversal of 651106500521 is 125005601156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642145795600 + 8960704921 = 801340^2 + 94661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651106500521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (651106500571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325553250260 + 325553250261.

It is an arithmetic number, because the mean of its divisors is an integer number (325553250261).

Almost surely, 2^651106500521 is an apocalyptic number.

It is an amenable number.

651106500521 is a deficient number, since it is larger than the sum of its proper divisors (1).

651106500521 is an equidigital number, since it uses as much as digits as its factorization.

651106500521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 32.

The spelling of 651106500521 in words is "six hundred fifty-one billion, one hundred six million, five hundred thousand, five hundred twenty-one".