68081657 has 4 divisors (see below), whose sum is σ = 77807616. Its totient is φ = 58355700.

The previous prime is 68081653. The next prime is 68081683. The reversal of 68081657 is 75618086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68081657 - 2² = 68081653 is a prime.

It is a super-2 number, since 2×68081657² = 9270224039731298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68081653) 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, 4862969 + ... + 4862982.

It is an arithmetic number, because the mean of its divisors is an integer number (19451904).

Almost surely, 2^68081657 is an apocalyptic number.

It is an amenable number.

68081657 is a deficient number, since it is larger than the sum of its proper divisors (9725959).

68081657 is an equidigital number, since it uses as much as digits as its factorization.

68081657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9725958.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 68081657 is about 8251.1609486181. The cubic root of 68081657 is about 408.3288250879.

The spelling of 68081657 in words is "sixty-eight million, eighty-one thousand, six hundred fifty-seven".