12918774691 has 16 divisors (see below), whose sum is σ = 13853121984. Its totient is φ = 12004521984.

The previous prime is 12918774689. The next prime is 12918774749. The reversal of 12918774691 is 19647781921.

It is a happy number.

It is not a de Polignac number, because 12918774691 - 2¹ = 12918774689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12918744691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579141 + ... + 601033.

It is an arithmetic number, because the mean of its divisors is an integer number (865820124).

Almost surely, 2^12918774691 is an apocalyptic number.

12918774691 is a deficient number, since it is larger than the sum of its proper divisors (934347293).

12918774691 is a wasteful number, since it uses less digits than its factorization.

12918774691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22350.

The product of its digits is 1524096, while the sum is 55.

The spelling of 12918774691 in words is "twelve billion, nine hundred eighteen million, seven hundred seventy-four thousand, six hundred ninety-one".