161525340584644 has 27 divisors (see below), whose sum is σ = 289733745145453. Its totient is φ = 78792340695200.

The previous prime is 161525340584623. The next prime is 161525340584683. The reversal of 161525340584644 is 446485043525161.

The square root of 161525340584644 is 12709262.

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., 7783196066244 + 153742144518400 = 2789838^2 + 12399280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1042081989 + ... + 1042236979.

Almost surely, 2^{161525340584644} is an apocalyptic number.

161525340584644 is the 12709262-nd square number.

It is an amenable number.

161525340584644 is a deficient number, since it is larger than the sum of its proper divisors (128208404560809).

161525340584644 is an frugal number, since it uses more digits than its factorization.

161525340584644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310068 (or 155034 counting only the distinct ones).

The product of its (nonzero) digits is 55296000, while the sum is 58.

The spelling of 161525340584644 in words is "one hundred sixty-one trillion, five hundred twenty-five billion, three hundred forty million, five hundred eighty-four thousand, six hundred forty-four".