161155377 has 6 divisors (see below), whose sum is σ = 232780002. Its totient is φ = 107436912.

The previous prime is 161155369. The next prime is 161155381. The reversal of 161155377 is 773551161.

161155377 is a `hidden beast` number, since 1 + 6 + 115 + 537 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 153735201 + 7420176 = 12399^2 + 2724^2 .

It is not a de Polignac number, because 161155377 - 2³ = 161155369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161155367) 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, 8953068 + ... + 8953085.

It is an arithmetic number, because the mean of its divisors is an integer number (38796667).

Almost surely, 2^161155377 is an apocalyptic number.

It is an amenable number.

161155377 is a deficient number, since it is larger than the sum of its proper divisors (71624625).

161155377 is a wasteful number, since it uses less digits than its factorization.

161155377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17906159 (or 17906156 counting only the distinct ones).

The product of its digits is 22050, while the sum is 36.

The square root of 161155377 is about 12694.6987754732. The cubic root of 161155377 is about 544.1871303755.

The spelling of 161155377 in words is "one hundred sixty-one million, one hundred fifty-five thousand, three hundred seventy-seven".