161783261584 has 60 divisors (see below), whose sum is σ = 368728548300. Its totient is φ = 68556601344.

The previous prime is 161783261551. The next prime is 161783261597. The reversal of 161783261584 is 485162387161.

It can be written as a sum of positive squares in 2 ways, for example, as 37315421584 + 124467840000 = 193172^2 + 352800^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1089529 + ... + 1229080.

It is an arithmetic number, because the mean of its divisors is an integer number (6145475805).

Almost surely, 2^161783261584 is an apocalyptic number.

161783261584 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161783261584 is an abundant number, since it is smaller than the sum of its proper divisors (206945286716).

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

161783261584 is a wasteful number, since it uses less digits than its factorization.

161783261584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318720 (or 2318707 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 161783261584 in words is "one hundred sixty-one billion, seven hundred eighty-three million, two hundred sixty-one thousand, five hundred eighty-four".