15115661601 has 8 divisors (see below), whose sum is σ = 20154783360. Its totient is φ = 10076823792.

The previous prime is 15115661599. The next prime is 15115661657. The reversal of 15115661601 is 10616651151.

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

It is not a de Polignac number, because 15115661601 - 2¹ = 15115661599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15115661201) 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, 175096 + ... + 246758.

It is an arithmetic number, because the mean of its divisors is an integer number (2519347920).

Almost surely, 2^15115661601 is an apocalyptic number.

It is an amenable number.

15115661601 is a deficient number, since it is larger than the sum of its proper divisors (5039121759).

15115661601 is an equidigital number, since it uses as much as digits as its factorization.

15115661601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141975.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 15115661601 in words is "fifteen billion, one hundred fifteen million, six hundred sixty-one thousand, six hundred one".