309093773918 has 4 divisors (see below), whose sum is σ = 463640660880. Its totient is φ = 154546886958.

The previous prime is 309093773899. The next prime is 309093773921. The reversal of 309093773918 is 819377390903.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×309093773918² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77273443478 + ... + 77273443481.

It is an arithmetic number, because the mean of its divisors is an integer number (115910165220).

Almost surely, 2^309093773918 is an apocalyptic number.

309093773918 is a deficient number, since it is larger than the sum of its proper divisors (154546886962).

309093773918 is a wasteful number, since it uses less digits than its factorization.

309093773918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154546886961.

The product of its (nonzero) digits is 7715736, while the sum is 59.

The spelling of 309093773918 in words is "three hundred nine billion, ninety-three million, seven hundred seventy-three thousand, nine hundred eighteen".