11974779655 has 4 divisors (see below), whose sum is σ = 14369735592. Its totient is φ = 9579823720.

The previous prime is 11974779637. The next prime is 11974779757. The reversal of 11974779655 is 55697747911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55697747911 = 13 ⋅4284442147.

It is not a de Polignac number, because 11974779655 - 2⁵ = 11974779623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11974779593 and 11974779602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197477961 + ... + 1197477970.

It is an arithmetic number, because the mean of its divisors is an integer number (3592433898).

Almost surely, 2^11974779655 is an apocalyptic number.

11974779655 is a deficient number, since it is larger than the sum of its proper divisors (2394955937).

11974779655 is an equidigital number, since it uses as much as digits as its factorization.

11974779655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394955936.

The product of its digits is 16669800, while the sum is 61.

The spelling of 11974779655 in words is "eleven billion, nine hundred seventy-four million, seven hundred seventy-nine thousand, six hundred fifty-five".