11637878642 has 8 divisors (see below), whose sum is σ = 18799650156. Its totient is φ = 5371328592.

The previous prime is 11637878599. The next prime is 11637878677. The reversal of 11637878642 is 24687873611.

It is a happy number.

It is a Cunningham number, because it is equal to 107879²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 11637878641 + 1 = 107879^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 223805333 + ... + 223805384.

Almost surely, 2^11637878642 is an apocalyptic number.

11637878642 is a deficient number, since it is larger than the sum of its proper divisors (7161771514).

11637878642 is a wasteful number, since it uses less digits than its factorization.

11637878642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447610732.

The product of its digits is 2709504, while the sum is 53.

The spelling of 11637878642 in words is "eleven billion, six hundred thirty-seven million, eight hundred seventy-eight thousand, six hundred forty-two".