161953243508 has 24 divisors (see below), whose sum is σ = 324025766400. Its totient is φ = 69382973088.

The previous prime is 161953243471. The next prime is 161953243523. The reversal of 161953243508 is 805342359161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 987503 + ... + 1139766.

It is an arithmetic number, because the mean of its divisors is an integer number (13501073600).

Almost surely, 2^161953243508 is an apocalyptic number.

It is an amenable number.

161953243508 is an abundant number, since it is smaller than the sum of its proper divisors (162072522892).

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

161953243508 is a wasteful number, since it uses less digits than its factorization.

161953243508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129999 (or 2129997 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 161953243508 in words is "one hundred sixty-one billion, nine hundred fifty-three million, two hundred forty-three thousand, five hundred eight".