57161651661 has 12 divisors (see below), whose sum is σ = 83494548540. Its totient is φ = 37679590080.

The previous prime is 57161651609. The next prime is 57161651663. The reversal of 57161651661 is 16615616175.

57161651661 is a `hidden beast` number, since 5 + 71 + 6 + 1 + 6 + 516 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16788384900 + 40373266761 = 129570^2 + 200931^2 .

It is not a de Polignac number, because 57161651661 - 2¹⁸ = 57161389517 is a prime.

It is a super-2 number, since 2×57161651661² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57161651663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35680630 + ... + 35682231.

It is an arithmetic number, because the mean of its divisors is an integer number (6957879045).

Almost surely, 2^57161651661 is an apocalyptic number.

It is an amenable number.

57161651661 is a deficient number, since it is larger than the sum of its proper divisors (26332896879).

57161651661 is a wasteful number, since it uses less digits than its factorization.

57161651661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71362956 (or 71362953 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The spelling of 57161651661 in words is "fifty-seven billion, one hundred sixty-one million, six hundred fifty-one thousand, six hundred sixty-one".