15115651561 has 8 divisors (see below), whose sum is σ = 15163156800. Its totient is φ = 15068177040.

The previous prime is 15115651559. The next prime is 15115651601. The reversal of 15115651561 is 16515651151.

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 15115651561 - 2¹ = 15115651559 is a prime.

It is a super-2 number, since 2×15115651561² (a number of 21 digits) contains 22 as substring.

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 15115651561.

It is not an unprimeable number, because it can be changed into a prime (15115651501) 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, 1336671 + ... + 1347931.

It is an arithmetic number, because the mean of its divisors is an integer number (1895394600).

Almost surely, 2^15115651561 is an apocalyptic number.

It is an amenable number.

15115651561 is a deficient number, since it is larger than the sum of its proper divisors (47505239).

15115651561 is a wasteful number, since it uses less digits than its factorization.

15115651561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15359.

The product of its digits is 22500, while the sum is 37.

The spelling of 15115651561 in words is "fifteen billion, one hundred fifteen million, six hundred fifty-one thousand, five hundred sixty-one".