68686261 has 4 divisors (see below), whose sum is σ = 78498592. Its totient is φ = 58873932.

The previous prime is 68686253. The next prime is 68686283. The reversal of 68686261 is 16268686.

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 68686261 - 2³ = 68686253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68686231) 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, 4906155 + ... + 4906168.

It is an arithmetic number, because the mean of its divisors is an integer number (19624648).

Almost surely, 2^68686261 is an apocalyptic number.

It is an amenable number.

68686261 is a deficient number, since it is larger than the sum of its proper divisors (9812331).

68686261 is an equidigital number, since it uses as much as digits as its factorization.

68686261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9812330.

The product of its digits is 165888, while the sum is 43.

The square root of 68686261 is about 8287.7174782928. The cubic root of 68686261 is about 409.5339956262.

The spelling of 68686261 in words is "sixty-eight million, six hundred eighty-six thousand, two hundred sixty-one".