12191615574 has 12 divisors (see below), whose sum is σ = 24383772084. Its totient is φ = 4063781704.

The previous prime is 12191615533. The next prime is 12191615591. The reversal of 12191615574 is 47551619121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 247924 + ... + 293000.

It is an arithmetic number, because the mean of its divisors is an integer number (2031981007).

Almost surely, 2^12191615574 is an apocalyptic number.

12191615574 is an abundant number, since it is smaller than the sum of its proper divisors (12192156510).

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

12191615574 is an frugal number, since it uses more digits than its factorization.

12191615574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90159 (or 45082 counting only the distinct ones).

The product of its digits is 75600, while the sum is 42.

The spelling of 12191615574 in words is "twelve billion, one hundred ninety-one million, six hundred fifteen thousand, five hundred seventy-four".