161813358236 has 12 divisors (see below), whose sum is σ = 283179990912. Its totient is φ = 80904789408.

The previous prime is 161813358151. The next prime is 161813358251. The reversal of 161813358236 is 632853318161.

It is a super-2 number, since 2×161813358236² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270140 + ... + 629763.

It is an arithmetic number, because the mean of its divisors is an integer number (23598332576).

Almost surely, 2^161813358236 is an apocalyptic number.

It is an amenable number.

161813358236 is a deficient number, since it is larger than the sum of its proper divisors (121366632676).

161813358236 is a wasteful number, since it uses less digits than its factorization.

161813358236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944860 (or 944858 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The spelling of 161813358236 in words is "one hundred sixty-one billion, eight hundred thirteen million, three hundred fifty-eight thousand, two hundred thirty-six".