161161957 has 12 divisors (see below), whose sum is σ = 178070508. Its totient is φ = 145745600.

The previous prime is 161161907. The next prime is 161161969. The reversal of 161161957 is 759161161.

161161957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 146676321 + 14485636 = 12111^2 + 3806^2 .

It is a de Polignac number, because none of the positive numbers 2^k-161161957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161161907) 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, 20457 + ... + 27217.

It is an arithmetic number, because the mean of its divisors is an integer number (14839209).

Almost surely, 2^161161957 is an apocalyptic number.

It is an amenable number.

161161957 is a deficient number, since it is larger than the sum of its proper divisors (16908551).

161161957 is a wasteful number, since it uses less digits than its factorization.

161161957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6980 (or 6969 counting only the distinct ones).

The product of its digits is 11340, while the sum is 37.

The square root of 161161957 is about 12694.9579361257. The cubic root of 161161957 is about 544.1945366908.

The spelling of 161161957 in words is "one hundred sixty-one million, one hundred sixty-one thousand, nine hundred fifty-seven".