115571721515 has 8 divisors (see below), whose sum is σ = 145985332560. Its totient is φ = 87591199392.

The previous prime is 115571721451. The next prime is 115571721569. The reversal of 115571721515 is 515127175511.

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 115571721515 - 2⁶ = 115571721451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608272124 + ... + 608272313.

It is an arithmetic number, because the mean of its divisors is an integer number (18248166570).

Almost surely, 2^115571721515 is an apocalyptic number.

115571721515 is a deficient number, since it is larger than the sum of its proper divisors (30413611045).

115571721515 is a wasteful number, since it uses less digits than its factorization.

115571721515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216544461.

The product of its digits is 61250, while the sum is 41.

The spelling of 115571721515 in words is "one hundred fifteen billion, five hundred seventy-one million, seven hundred twenty-one thousand, five hundred fifteen".