15115616661 has 8 divisors (see below), whose sum is σ = 20161867264. Its totient is φ = 10073221920.

The previous prime is 15115616617. The next prime is 15115616689. The reversal of 15115616661 is 16661651151.

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

It is not a de Polignac number, because 15115616661 - 2⁷ = 15115616533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15115612661) 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, 954805 + ... + 970506.

It is an arithmetic number, because the mean of its divisors is an integer number (2520233408).

Almost surely, 2^15115616661 is an apocalyptic number.

It is an amenable number.

15115616661 is a deficient number, since it is larger than the sum of its proper divisors (5046250603).

15115616661 is a wasteful number, since it uses less digits than its factorization.

15115616661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927931.

The product of its digits is 32400, while the sum is 39.

The spelling of 15115616661 in words is "fifteen billion, one hundred fifteen million, six hundred sixteen thousand, six hundred sixty-one".