161855070 has 32 divisors (see below), whose sum is σ = 418334112. Its totient is φ = 39841152.

The previous prime is 161855069. The next prime is 161855093. The reversal of 161855070 is 70558161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207117 + ... + 207896.

It is an arithmetic number, because the mean of its divisors is an integer number (13072941).

Almost surely, 2^161855070 is an apocalyptic number.

161855070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161855070 is an abundant number, since it is smaller than the sum of its proper divisors (256479042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161855070 is a wasteful number, since it uses less digits than its factorization.

161855070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415036.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 161855070 is about 12722.2273993197. The cubic root of 161855070 is about 544.9735643548.

The spelling of 161855070 in words is "one hundred sixty-one million, eight hundred fifty-five thousand, seventy".