11872721517 has 8 divisors (see below), whose sum is σ = 15845390400. Its totient is φ = 7907600160.

The previous prime is 11872721513. The next prime is 11872721543. The reversal of 11872721517 is 71512727811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11872721517 - 2² = 11872721513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11872721513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1883209 + ... + 1889502.

It is an arithmetic number, because the mean of its divisors is an integer number (1980673800).

Almost surely, 2^11872721517 is an apocalyptic number.

It is an amenable number.

11872721517 is a deficient number, since it is larger than the sum of its proper divisors (3972668883).

11872721517 is a wasteful number, since it uses less digits than its factorization.

11872721517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773763.

The product of its digits is 54880, while the sum is 42.

The spelling of 11872721517 in words is "eleven billion, eight hundred seventy-two million, seven hundred twenty-one thousand, five hundred seventeen".