309661428818 has 16 divisors (see below), whose sum is σ = 533515747200. Its totient is φ = 132045145056.

The previous prime is 309661428799. The next prime is 309661428871. The reversal of 309661428818 is 818824166903.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55571771 + ... + 55577342.

It is an arithmetic number, because the mean of its divisors is an integer number (33344734200).

Almost surely, 2^309661428818 is an apocalyptic number.

309661428818 is a deficient number, since it is larger than the sum of its proper divisors (223854318382).

309661428818 is a wasteful number, since it uses less digits than its factorization.

309661428818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111149321.

The product of its (nonzero) digits is 3981312, while the sum is 56.

The spelling of 309661428818 in words is "three hundred nine billion, six hundred sixty-one million, four hundred twenty-eight thousand, eight hundred eighteen".