15121556161616 has 20 divisors (see below), whose sum is σ = 29298919130112. Its totient is φ = 7560544773216.

The previous prime is 15121556161541. The next prime is 15121556161619. The reversal of 15121556161616 is 61616165512151.

It is a super-2 number, since 2×15121556161616² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15121556161619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14046416 + ... + 15084591.

Almost surely, 2^{15121556161616} is an apocalyptic number.

15121556161616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15121556161616 is a deficient number, since it is larger than the sum of its proper divisors (14177362968496).

15121556161616 is a wasteful number, since it uses less digits than its factorization.

15121556161616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29163458 (or 29163452 counting only the distinct ones).

The product of its digits is 324000, while the sum is 47.

The spelling of 15121556161616 in words is "fifteen trillion, one hundred twenty-one billion, five hundred fifty-six million, one hundred sixty-one thousand, six hundred sixteen".