1612871051661 has 6 divisors (see below), whose sum is σ = 2329702630190. Its totient is φ = 1075247367768.

The previous prime is 1612871051657. The next prime is 1612871051689. The reversal of 1612871051661 is 1661501782161.

1612871051661 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 8 + 71 + 0 + 516 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1021502361636 + 591368690025 = 1010694^2 + 769005^2 .

It is not a de Polignac number, because 1612871051661 - 2² = 1612871051657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1612871051651) 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, 89603947306 + ... + 89603947323.

Almost surely, 2^{1612871051661} is an apocalyptic number.

It is an amenable number.

1612871051661 is a deficient number, since it is larger than the sum of its proper divisors (716831578529).

1612871051661 is a wasteful number, since it uses less digits than its factorization.

1612871051661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179207894635 (or 179207894632 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 1612871051661 in words is "one trillion, six hundred twelve billion, eight hundred seventy-one million, fifty-one thousand, six hundred sixty-one".