161969868900 has 432 divisors, whose sum is σ = 589837248000. Its totient is φ = 36412830720.

The previous prime is 161969868883. The next prime is 161969868943. The reversal of 161969868900 is 9868969161.

161969868900 is a `hidden beast` number, since 1 + 619 + 6 + 9 + 8 + 6 + 8 + 9 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 102317509 + ... + 102319091.

It is an arithmetic number, because the mean of its divisors is an integer number (1365364000).

Almost surely, 2^161969868900 is an apocalyptic number.

161969868900 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 161969868900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294918624000).

161969868900 is an abundant number, since it is smaller than the sum of its proper divisors (427867379100).

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

161969868900 is a wasteful number, since it uses less digits than its factorization.

161969868900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868 (or 1858 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The spelling of 161969868900 in words is "one hundred sixty-one billion, nine hundred sixty-nine million, eight hundred sixty-eight thousand, nine hundred".