201656161061 has 4 divisors (see below), whose sum is σ = 203440728972. Its totient is φ = 199871593152.

The previous prime is 201656161039. The next prime is 201656161087. The reversal of 201656161061 is 160161656102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2767812100 + 198888348961 = 52610^2 + 445969^2 .

It is a cyclic number.

It is not a de Polignac number, because 201656161061 - 2³⁰ = 200582419237 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 (201655161061) 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, 892283786 + ... + 892284011.

It is an arithmetic number, because the mean of its divisors is an integer number (50860182243).

Almost surely, 2^201656161061 is an apocalyptic number.

It is an amenable number.

201656161061 is a deficient number, since it is larger than the sum of its proper divisors (1784567911).

201656161061 is a wasteful number, since it uses less digits than its factorization.

201656161061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784567910.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 201656161061 in words is "two hundred one billion, six hundred fifty-six million, one hundred sixty-one thousand, sixty-one".