161742317584 has 45 divisors (see below), whose sum is σ = 324648062557. Its totient is φ = 78059976512.

The previous prime is 161742317563. The next prime is 161742317603. The reversal of 161742317584 is 485713247161.

The square root of 161742317584 is 402172.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 84813747984 + 76928569600 = 291228^2 + 277360^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 46650219 + ... + 46653685.

Almost surely, 2^161742317584 is an apocalyptic number.

161742317584 is the 402172-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161742317584

161742317584 is an abundant number, since it is smaller than the sum of its proper divisors (162905744973).

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

161742317584 is an frugal number, since it uses more digits than its factorization.

161742317584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000 (or 3498 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 49.

Multiplying 161742317584 by its sum of digits (49), we get a square (7925373561616 = 2815204²).

The spelling of 161742317584 in words is "one hundred sixty-one billion, seven hundred forty-two million, three hundred seventeen thousand, five hundred eighty-four".