11644417138 has 32 divisors (see below), whose sum is σ = 19342302336. Its totient is φ = 5229489408.

The previous prime is 11644417133. The next prime is 11644417153. The reversal of 11644417138 is 83171444611.

It is a super-2 number, since 2×11644417138² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11644417138.

It is not an unprimeable number, because it can be changed into a prime (11644417133) 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, 329620 + ... + 363232.

It is an arithmetic number, because the mean of its divisors is an integer number (604446948).

Almost surely, 2^11644417138 is an apocalyptic number.

11644417138 is a deficient number, since it is larger than the sum of its proper divisors (7697885198).

11644417138 is a wasteful number, since it uses less digits than its factorization.

11644417138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34098.

The product of its digits is 64512, while the sum is 40.

The spelling of 11644417138 in words is "eleven billion, six hundred forty-four million, four hundred seventeen thousand, one hundred thirty-eight".