161069913720 has 256 divisors, whose sum is σ = 567851328000. Its totient is φ = 40497408000.

The previous prime is 161069913713. The next prime is 161069913749. The reversal of 161069913720 is 27319960161.

161069913720 is a `hidden beast` number, since 1 + 610 + 6 + 9 + 9 + 1 + 3 + 7 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4311120 + ... + 4348320.

It is an arithmetic number, because the mean of its divisors is an integer number (2218169250).

Almost surely, 2^161069913720 is an apocalyptic number.

161069913720 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 161069913720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283925664000).

161069913720 is an abundant number, since it is smaller than the sum of its proper divisors (406781414280).

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

161069913720 is a wasteful number, since it uses less digits than its factorization.

161069913720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37451 (or 37441 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 161069913720 in words is "one hundred sixty-one billion, sixty-nine million, nine hundred thirteen thousand, seven hundred twenty".