16161111551615 has 8 divisors (see below), whose sum is σ = 19534891044240. Its totient is φ = 12834517786432.

The previous prime is 16161111551581. The next prime is 16161111551623. The reversal of 16161111551615 is 51615511116161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16161111551615 is a prime.

It is a super-2 number, since 2×16161111551615² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 11796431105 + ... + 11796432474.

It is an arithmetic number, because the mean of its divisors is an integer number (2441861380530).

Almost surely, 2^{16161111551615} is an apocalyptic number.

16161111551615 is a deficient number, since it is larger than the sum of its proper divisors (3373779492625).

16161111551615 is a wasteful number, since it uses less digits than its factorization.

16161111551615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23592863721.

The product of its digits is 27000, while the sum is 41.

Adding to 16161111551615 its reverse (51615511116161), we get a palindrome (67776622667776).

The spelling of 16161111551615 in words is "sixteen trillion, one hundred sixty-one billion, one hundred eleven million, five hundred fifty-one thousand, six hundred fifteen".