11974664642 has 4 divisors (see below), whose sum is σ = 17961996966. Its totient is φ = 5987332320.

The previous prime is 11974664627. The next prime is 11974664677. The reversal of 11974664642 is 24646647911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24646647911 = 89137 ⋅276503.

It can be written as a sum of positive squares in only one way, i.e., 9970222201 + 2004442441 = 99851^2 + 44771^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2993666159 + ... + 2993666162.

Almost surely, 2^11974664642 is an apocalyptic number.

11974664642 is a deficient number, since it is larger than the sum of its proper divisors (5987332324).

11974664642 is an equidigital number, since it uses as much as digits as its factorization.

11974664642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5987332323.

The product of its digits is 1741824, while the sum is 50.

The spelling of 11974664642 in words is "eleven billion, nine hundred seventy-four million, six hundred sixty-four thousand, six hundred forty-two".