11917994690 has 32 divisors (see below), whose sum is σ = 24932568960. Its totient is φ = 4016911104.

The previous prime is 11917994611. The next prime is 11917994723. The reversal of 11917994690 is 9649971911.

It is a super-2 number, since 2×11917994690² (a number of 21 digits) contains 22 as substring.

It is a Curzon 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, 1438727 + ... + 1446986.

It is an arithmetic number, because the mean of its divisors is an integer number (779142780).

Almost surely, 2^11917994690 is an apocalyptic number.

11917994690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11917994690 is an abundant number, since it is smaller than the sum of its proper divisors (13014574270).

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

11917994690 is a wasteful number, since it uses less digits than its factorization.

11917994690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885786.

The product of its (nonzero) digits is 1102248, while the sum is 56.

The spelling of 11917994690 in words is "eleven billion, nine hundred seventeen million, nine hundred ninety-four thousand, six hundred ninety".