161611155000 has 120 divisors (see below), whose sum is σ = 546946171200. Its totient is φ = 43096296000.

The previous prime is 161611154981. The next prime is 161611155001. The reversal of 161611155000 is 551116161.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×161611155000² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161611155001) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1750680 + ... + 1840679.

It is an arithmetic number, because the mean of its divisors is an integer number (4557884760).

Almost surely, 2^161611155000 is an apocalyptic number.

161611155000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161611155000 is an abundant number, since it is smaller than the sum of its proper divisors (385335016200).

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

161611155000 is a wasteful number, since it uses less digits than its factorization.

161611155000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591391 (or 3591369 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The spelling of 161611155000 in words is "one hundred sixty-one billion, six hundred eleven million, one hundred fifty-five thousand".