11644567407 has 24 divisors (see below), whose sum is σ = 18695231568. Its totient is φ = 6924153600.

The previous prime is 11644567349. The next prime is 11644567423. The reversal of 11644567407 is 70476544611.

11644567407 is a `hidden beast` number, since 1 + 1 + 6 + 44 + 567 + 40 + 7 = 666.

It is not a de Polignac number, because 11644567407 - 2⁶ = 11644567343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11644567507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1104394 + ... + 1114887.

It is an arithmetic number, because the mean of its divisors is an integer number (778967982).

Almost surely, 2^11644567407 is an apocalyptic number.

11644567407 is a deficient number, since it is larger than the sum of its proper divisors (7050664161).

11644567407 is a wasteful number, since it uses less digits than its factorization.

11644567407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219351 (or 2219348 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 11644567407 in words is "eleven billion, six hundred forty-four million, five hundred sixty-seven thousand, four hundred seven".