161603153664 has 72 divisors (see below), whose sum is σ = 430363014480. Its totient is φ = 53834784768.

The previous prime is 161603153639. The next prime is 161603153681. The reversal of 161603153664 is 466351306161.

It is a super-2 number, since 2×161603153664² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1209082 + ... + 1336070.

It is an arithmetic number, because the mean of its divisors is an integer number (5977264090).

Almost surely, 2^161603153664 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 161603153664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215181507240).

161603153664 is an abundant number, since it is smaller than the sum of its proper divisors (268759860816).

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

161603153664 is a wasteful number, since it uses less digits than its factorization.

161603153664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128665 (or 128651 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 161603153664 in words is "one hundred sixty-one billion, six hundred three million, one hundred fifty-three thousand, six hundred sixty-four".