161218602 has 24 divisors (see below), whose sum is σ = 354094884. Its totient is φ = 53002944.

The previous prime is 161218489. The next prime is 161218609. The reversal of 161218602 is 206812161.

It can be written as a sum of positive squares in 2 ways, for example, as 145226601 + 15992001 = 12051^2 + 3999^2 .

It is not an unprimeable number, because it can be changed into a prime (161218609) 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, 60033 + ... + 62660.

Almost surely, 2^161218602 is an apocalyptic number.

161218602 is an abundant number, since it is smaller than the sum of its proper divisors (192876282).

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

161218602 is a wasteful number, since it uses less digits than its factorization.

161218602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122774 (or 122771 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 161218602 is about 12697.1887439701. The cubic root of 161218602 is about 544.2582868240.

The spelling of 161218602 in words is "one hundred sixty-one million, two hundred eighteen thousand, six hundred two".