161285213240 has 64 divisors (see below), whose sum is σ = 366959194560. Its totient is φ = 63794995200.

The previous prime is 161285213239. The next prime is 161285213261. The reversal of 161285213240 is 42312582161.

It is a self number, because there is not a number n which added to its sum of digits gives 161285213240.

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, 1226690 + ... + 1351790.

It is an arithmetic number, because the mean of its divisors is an integer number (5733737415).

Almost surely, 2^161285213240 is an apocalyptic number.

161285213240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161285213240 is an abundant number, since it is smaller than the sum of its proper divisors (205673981320).

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

161285213240 is a wasteful number, since it uses less digits than its factorization.

161285213240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125472 (or 125468 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 161285213240 in words is "one hundred sixty-one billion, two hundred eighty-five million, two hundred thirteen thousand, two hundred forty".