651656166437 has 2 divisors, whose sum is σ = 651656166438. Its totient is φ = 651656166436.

The previous prime is 651656166431. The next prime is 651656166503. The reversal of 651656166437 is 734661656156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522402255076 + 129253911361 = 722774^2 + 359519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651656166437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651656166431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325828083218 + 325828083219.

It is an arithmetic number, because the mean of its divisors is an integer number (325828083219).

Almost surely, 2^651656166437 is an apocalyptic number.

It is an amenable number.

651656166437 is a deficient number, since it is larger than the sum of its proper divisors (1).

651656166437 is an equidigital number, since it uses as much as digits as its factorization.

651656166437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 56.

The spelling of 651656166437 in words is "six hundred fifty-one billion, six hundred fifty-six million, one hundred sixty-six thousand, four hundred thirty-seven".