12355691478 has 32 divisors (see below), whose sum is σ = 26622607200. Its totient is φ = 3800272896.

The previous prime is 12355691461. The next prime is 12355691503. The reversal of 12355691478 is 87419655321.

It is a super-2 number, since 2×12355691478² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12355691478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180288 + ... + 239196.

It is an arithmetic number, because the mean of its divisors is an integer number (831956475).

Almost surely, 2^12355691478 is an apocalyptic number.

12355691478 is an abundant number, since it is smaller than the sum of its proper divisors (14266915722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12355691478 is a wasteful number, since it uses less digits than its factorization.

12355691478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61616.

The product of its digits is 1814400, while the sum is 51.

The spelling of 12355691478 in words is "twelve billion, three hundred fifty-five million, six hundred ninety-one thousand, four hundred seventy-eight".