15660160161561 has 6 divisors (see below), whose sum is σ = 22620231344490. Its totient is φ = 10440106774368.

The previous prime is 15660160161559. The next prime is 15660160161563. The reversal of 15660160161561 is 16516106106651.

15660160161561 is a `hidden beast` number, since 1 + 5 + 6 + 60 + 16 + 0 + 16 + 1 + 561 = 666.

It is an interprime number because it is at equal distance from previous prime (15660160161559) and next prime (15660160161563).

It can be written as a sum of positive squares in only one way, i.e., 15588954441225 + 71205720336 = 3948285^2 + 266844^2 .

It is not a de Polignac number, because 15660160161561 - 2¹ = 15660160161559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15660160161563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 870008897856 + ... + 870008897873.

It is an arithmetic number, because the mean of its divisors is an integer number (3770038557415).

Almost surely, 2^{15660160161561} is an apocalyptic number.

It is an amenable number.

15660160161561 is a deficient number, since it is larger than the sum of its proper divisors (6960071182929).

15660160161561 is a wasteful number, since it uses less digits than its factorization.

15660160161561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740017795735 (or 1740017795732 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 15660160161561 in words is "fifteen trillion, six hundred sixty billion, one hundred sixty million, one hundred sixty-one thousand, five hundred sixty-one".