161539309240 has 64 divisors (see below), whose sum is σ = 365286036960. Its totient is φ = 64292390400.

The previous prime is 161539309237. The next prime is 161539309247. The reversal of 161539309240 is 42903935161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161539309247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7925142 + ... + 7945498.

Almost surely, 2^161539309240 is an apocalyptic number.

161539309240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161539309240 is an abundant number, since it is smaller than the sum of its proper divisors (203746727720).

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

161539309240 is a wasteful number, since it uses less digits than its factorization.

161539309240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21352 (or 21348 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 161539309240 in words is "one hundred sixty-one billion, five hundred thirty-nine million, three hundred nine thousand, two hundred forty".