68709167257 has 4 divisors (see below), whose sum is σ = 72750882996. Its totient is φ = 64667451520.

The previous prime is 68709167201. The next prime is 68709167269. The reversal of 68709167257 is 75276190786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56328376896 + 12380790361 = 237336^2 + 111269^2 .

It is a cyclic number.

It is not a de Polignac number, because 68709167257 - 2²⁷ = 68574949529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68709167287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020857844 + ... + 2020857877.

It is an arithmetic number, because the mean of its divisors is an integer number (18187720749).

Almost surely, 2^68709167257 is an apocalyptic number.

It is an amenable number.

68709167257 is a deficient number, since it is larger than the sum of its proper divisors (4041715739).

68709167257 is a wasteful number, since it uses less digits than its factorization.

68709167257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041715738.

The product of its (nonzero) digits is 8890560, while the sum is 58.

The spelling of 68709167257 in words is "sixty-eight billion, seven hundred nine million, one hundred sixty-seven thousand, two hundred fifty-seven".