306656768409 has 4 divisors (see below), whose sum is σ = 408875691216. Its totient is φ = 204437845604.

The previous prime is 306656768393. The next prime is 306656768417. The reversal of 306656768409 is 904867656603.

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, and also an emirpimes, since its reverse is a distinct semiprime: 904867656603 = 3 ⋅301622552201.

It is a cyclic number.

It is not a de Polignac number, because 306656768409 - 2⁴ = 306656768393 is a prime.

It is a super-2 number, since 2×306656768409² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (306656768459) 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, 51109461399 + ... + 51109461404.

It is an arithmetic number, because the mean of its divisors is an integer number (102218922804).

Almost surely, 2^306656768409 is an apocalyptic number.

It is an amenable number.

306656768409 is a deficient number, since it is larger than the sum of its proper divisors (102218922807).

306656768409 is a wasteful number, since it uses less digits than its factorization.

306656768409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102218922806.

The product of its (nonzero) digits is 39191040, while the sum is 60.

The spelling of 306656768409 in words is "three hundred six billion, six hundred fifty-six million, seven hundred sixty-eight thousand, four hundred nine".