68580246921 has 4 divisors (see below), whose sum is σ = 91440329232. Its totient is φ = 45720164612.

The previous prime is 68580246877. The next prime is 68580246949. The reversal of 68580246921 is 12964208586.

It is a happy number.

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 68580246921 - 2⁶ = 68580246857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68580247921) 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, 11430041151 + ... + 11430041156.

It is an arithmetic number, because the mean of its divisors is an integer number (22860082308).

Almost surely, 2^68580246921 is an apocalyptic number.

It is an amenable number.

68580246921 is a deficient number, since it is larger than the sum of its proper divisors (22860082311).

68580246921 is a wasteful number, since it uses less digits than its factorization.

68580246921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22860082310.

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 68580246921 in words is "sixty-eight billion, five hundred eighty million, two hundred forty-six thousand, nine hundred twenty-one".