15161651666661 has 16 divisors (see below), whose sum is σ = 20250305412480. Its totient is φ = 10090389872640.

The previous prime is 15161651666657. The next prime is 15161651666771. The reversal of 15161651666661 is 16666615616151.

It is not a de Polignac number, because 15161651666661 - 2² = 15161651666657 is a prime.

It is a super-2 number, since 2×15161651666661² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15161651668661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7784056 + ... + 9534926.

It is an arithmetic number, because the mean of its divisors is an integer number (1265644088280).

Almost surely, 2^{15161651666661} is an apocalyptic number.

It is an amenable number.

15161651666661 is a deficient number, since it is larger than the sum of its proper divisors (5088653745819).

15161651666661 is a wasteful number, since it uses less digits than its factorization.

15161651666661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755836.

The product of its digits is 6998400, while the sum is 57.

The spelling of 15161651666661 in words is "fifteen trillion, one hundred sixty-one billion, six hundred fifty-one million, six hundred sixty-six thousand, six hundred sixty-one".