115721215651 has 8 divisors (see below), whose sum is σ = 119230978464. Its totient is φ = 112231566720.

The previous prime is 115721215613. The next prime is 115721215697. The reversal of 115721215651 is 156512127511.

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

It is a cyclic number.

It is not a de Polignac number, because 115721215651 - 2⁹ = 115721215139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115721215651.

It is not an unprimeable number, because it can be changed into a prime (115721215601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5016790 + ... + 5039803.

It is an arithmetic number, because the mean of its divisors is an integer number (14903872308).

Almost surely, 2^115721215651 is an apocalyptic number.

115721215651 is a deficient number, since it is larger than the sum of its proper divisors (3509762813).

115721215651 is a wasteful number, since it uses less digits than its factorization.

115721215651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10056941.

The product of its digits is 21000, while the sum is 37.

The spelling of 115721215651 in words is "one hundred fifteen billion, seven hundred twenty-one million, two hundred fifteen thousand, six hundred fifty-one".