161161955 has 8 divisors (see below), whose sum is σ = 204770592. Its totient is φ = 121345408.

The previous prime is 161161907. The next prime is 161161969. The reversal of 161161955 is 559161161.

161161955 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161161955 is a prime.

It is a super-3 number, since 3×161161955³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947927 + ... + 948096.

It is an arithmetic number, because the mean of its divisors is an integer number (25596324).

Almost surely, 2^161161955 is an apocalyptic number.

161161955 is a deficient number, since it is larger than the sum of its proper divisors (43608637).

161161955 is a wasteful number, since it uses less digits than its factorization.

161161955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896045.

The product of its digits is 8100, while the sum is 35.

The square root of 161161955 is about 12694.9578573542. The cubic root of 161161955 is about 544.1945344397.

The spelling of 161161955 in words is "one hundred sixty-one million, one hundred sixty-one thousand, nine hundred fifty-five".