306621068681 has 4 divisors (see below), whose sum is σ = 306816744192. Its totient is φ = 306425393172.

The previous prime is 306621068651. The next prime is 306621068731. The reversal of 306621068681 is 186860126603.

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 306621068681 - 2¹⁰ = 306621067657 is a prime.

It is a super-2 number, since 2×306621068681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (306621068651) 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, 97835405 + ... + 97838538.

It is an arithmetic number, because the mean of its divisors is an integer number (76704186048).

Almost surely, 2^306621068681 is an apocalyptic number.

It is an amenable number.

306621068681 is a deficient number, since it is larger than the sum of its proper divisors (195675511).

306621068681 is a wasteful number, since it uses less digits than its factorization.

306621068681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195675510.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 306621068681 in words is "three hundred six billion, six hundred twenty-one million, sixty-eight thousand, six hundred eighty-one".