161858995200 has 1584 divisors, whose sum is σ = 711835243200. Its totient is φ = 36369285120.

The previous prime is 161858995187. The next prime is 161858995229. The reversal of 161858995200 is 2599858161.

161858995200 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 589 + 9 + 52 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2743372771 + ... + 2743372829.

Almost surely, 2^161858995200 is an apocalyptic number.

161858995200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161858995200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355917621600).

161858995200 is an abundant number, since it is smaller than the sum of its proper divisors (549976248000).

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

161858995200 is an frugal number, since it uses more digits than its factorization.

161858995200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 54.

The spelling of 161858995200 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, nine hundred ninety-five thousand, two hundred".