11451621666 has 32 divisors (see below), whose sum is σ = 23237117568. Its totient is φ = 3761614080.

The previous prime is 11451621653. The next prime is 11451621677. The reversal of 11451621666 is 66612615411.

It is a happy number.

It is a super-2 number, since 2×11451621666² (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, 1084026 + ... + 1094538.

It is an arithmetic number, because the mean of its divisors is an integer number (726159924).

Almost surely, 2^11451621666 is an apocalyptic number.

11451621666 is an abundant number, since it is smaller than the sum of its proper divisors (11785495902).

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

11451621666 is a wasteful number, since it uses less digits than its factorization.

11451621666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13146.

The product of its digits is 51840, while the sum is 39.

The spelling of 11451621666 in words is "eleven billion, four hundred fifty-one million, six hundred twenty-one thousand, six hundred sixty-six".