12191970554 has 4 divisors (see below), whose sum is σ = 18287955834. Its totient is φ = 6095985276.

The previous prime is 12191970547. The next prime is 12191970587. The reversal of 12191970554 is 45507919121.

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

It can be written as a sum of positive squares in only one way, i.e., 11788964929 + 403005625 = 108577^2 + 20075^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3047992637 + ... + 3047992640.

Almost surely, 2^12191970554 is an apocalyptic number.

12191970554 is a deficient number, since it is larger than the sum of its proper divisors (6095985280).

12191970554 is an equidigital number, since it uses as much as digits as its factorization.

12191970554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6095985279.

The product of its (nonzero) digits is 113400, while the sum is 44.

The spelling of 12191970554 in words is "twelve billion, one hundred ninety-one million, nine hundred seventy thousand, five hundred fifty-four".