651556638679 has 2 divisors, whose sum is σ = 651556638680. Its totient is φ = 651556638678.

The previous prime is 651556638617. The next prime is 651556638721. The reversal of 651556638679 is 976836655156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 651556638679 - 2¹¹ = 651556636631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651556638379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325778319339 + 325778319340.

It is an arithmetic number, because the mean of its divisors is an integer number (325778319340).

Almost surely, 2^651556638679 is an apocalyptic number.

651556638679 is a deficient number, since it is larger than the sum of its proper divisors (1).

651556638679 is an equidigital number, since it uses as much as digits as its factorization.

651556638679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944000, while the sum is 67.

The spelling of 651556638679 in words is "six hundred fifty-one billion, five hundred fifty-six million, six hundred thirty-eight thousand, six hundred seventy-nine".