11666997618 has 32 divisors (see below), whose sum is σ = 24914774016. Its totient is φ = 3633400848.

The previous prime is 11666997613. The next prime is 11666997619. The reversal of 11666997618 is 81679966611.

It is a super-2 number, since 2×11666997618² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11666997613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 977130 + ... + 988997.

It is an arithmetic number, because the mean of its divisors is an integer number (778586688).

Almost surely, 2^11666997618 is an apocalyptic number.

11666997618 is an abundant number, since it is smaller than the sum of its proper divisors (13247776398).

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

11666997618 is a wasteful number, since it uses less digits than its factorization.

11666997618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966198.

The product of its digits is 5878656, while the sum is 60.

The spelling of 11666997618 in words is "eleven billion, six hundred sixty-six million, nine hundred ninety-seven thousand, six hundred eighteen".