161502040240 has 20 divisors (see below), whose sum is σ = 375492243744. Its totient is φ = 64600816064.

The previous prime is 161502040229. The next prime is 161502040247. The reversal of 161502040240 is 42040205161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (161502040247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1009387672 + ... + 1009387831.

Almost surely, 2^161502040240 is an apocalyptic number.

161502040240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161502040240 is an abundant number, since it is smaller than the sum of its proper divisors (213990203504).

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

161502040240 is a wasteful number, since it uses less digits than its factorization.

161502040240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018775516 (or 2018775510 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 161502040240 in words is "one hundred sixty-one billion, five hundred two million, forty thousand, two hundred forty".