68757520861 has 2 divisors, whose sum is σ = 68757520862. Its totient is φ = 68757520860.

The previous prime is 68757520759. The next prime is 68757520903. The reversal of 68757520861 is 16802575786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56420975961 + 12336544900 = 237531^2 + 111070^2 .

It is a cyclic number.

It is not a de Polignac number, because 68757520861 - 2²³ = 68749132253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68757520661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34378760430 + 34378760431.

It is an arithmetic number, because the mean of its divisors is an integer number (34378760431).

Almost surely, 2^68757520861 is an apocalyptic number.

It is an amenable number.

68757520861 is a deficient number, since it is larger than the sum of its proper divisors (1).

68757520861 is an equidigital number, since it uses as much as digits as its factorization.

68757520861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5644800, while the sum is 55.

The spelling of 68757520861 in words is "sixty-eight billion, seven hundred fifty-seven million, five hundred twenty thousand, eight hundred sixty-one".