68121577637 has 2 divisors, whose sum is σ = 68121577638. Its totient is φ = 68121577636.

The previous prime is 68121577627. The next prime is 68121577663. The reversal of 68121577637 is 73677512186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37100152996 + 31021424641 = 192614^2 + 176129^2 .

It is a cyclic number.

It is not a de Polignac number, because 68121577637 - 2¹⁰ = 68121576613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68121577627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34060788818 + 34060788819.

It is an arithmetic number, because the mean of its divisors is an integer number (34060788819).

Almost surely, 2^68121577637 is an apocalyptic number.

It is an amenable number.

68121577637 is a deficient number, since it is larger than the sum of its proper divisors (1).

68121577637 is an equidigital number, since it uses as much as digits as its factorization.

68121577637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 53.

The spelling of 68121577637 in words is "sixty-eight billion, one hundred twenty-one million, five hundred seventy-seven thousand, six hundred thirty-seven".