161247072204 has 72 divisors (see below), whose sum is σ = 413555714208. Its totient is φ = 52964029440.

The previous prime is 161247072197. The next prime is 161247072221. The reversal of 161247072204 is 402270742161.

161247072204 is a `hidden beast` number, since 161 + 2 + 470 + 7 + 2 + 20 + 4 = 666.

161247072204 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5139814 + ... + 5171090.

It is an arithmetic number, because the mean of its divisors is an integer number (5743829364).

Almost surely, 2^161247072204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161247072204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206777857104).

161247072204 is an abundant number, since it is smaller than the sum of its proper divisors (252308642004).

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

161247072204 is a wasteful number, since it uses less digits than its factorization.

161247072204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33375 (or 33370 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The spelling of 161247072204 in words is "one hundred sixty-one billion, two hundred forty-seven million, seventy-two thousand, two hundred four".