11721664430 has 32 divisors (see below), whose sum is σ = 24117225984. Its totient is φ = 4018175136.

The previous prime is 11721664393. The next prime is 11721664453. The reversal of 11721664430 is 3446612711.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent 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, 575399 + ... + 595421.

It is an arithmetic number, because the mean of its divisors is an integer number (753663312).

Almost surely, 2^11721664430 is an apocalyptic number.

11721664430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11721664430 is an abundant number, since it is smaller than the sum of its proper divisors (12395561554).

11721664430 is a wasteful number, since it uses less digits than its factorization.

11721664430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28400.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 11721664430 in words is "eleven billion, seven hundred twenty-one million, six hundred sixty-four thousand, four hundred thirty".