15651665105161 has 4 divisors (see below), whose sum is σ = 15652900353024. Its totient is φ = 15650429857300.

The previous prime is 15651665105149. The next prime is 15651665105189. The reversal of 15651665105161 is 16150156615651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15651665105161 - 2²⁹ = 15651128234249 is a prime.

It is a super-2 number, since 2×15651665105161² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15651665109161) 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, 617604925 + ... + 617630266.

It is an arithmetic number, because the mean of its divisors is an integer number (3913225088256).

Almost surely, 2^{15651665105161} is an apocalyptic number.

It is an amenable number.

15651665105161 is a deficient number, since it is larger than the sum of its proper divisors (1235247863).

15651665105161 is a wasteful number, since it uses less digits than its factorization.

15651665105161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235247862.

The product of its (nonzero) digits is 810000, while the sum is 49.

The spelling of 15651665105161 in words is "fifteen trillion, six hundred fifty-one billion, six hundred sixty-five million, one hundred five thousand, one hundred sixty-one".