161103850020 has 120 divisors (see below), whose sum is σ = 535117585464. Its totient is φ = 40433900544.

The previous prime is 161103850013. The next prime is 161103850021. The reversal of 161103850020 is 20058301161.

161103850020 is a `hidden beast` number, since 16 + 110 + 38 + 500 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 23183716644 + 137920133376 = 152262^2 + 371376^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161103850021) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2897367 + ... + 2952446.

Almost surely, 2^161103850020 is an apocalyptic number.

161103850020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161103850020 is an abundant number, since it is smaller than the sum of its proper divisors (374013735444).

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

161103850020 is a wasteful number, since it uses less digits than its factorization.

161103850020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5849851 (or 5849840 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 161103850020 in words is "one hundred sixty-one billion, one hundred three million, eight hundred fifty thousand, twenty".