165969871236 has 135 divisors (see below), whose sum is σ = 470090597823. Its totient is φ = 51038320320.

The previous prime is 165969871129. The next prime is 165969871273. The reversal of 165969871236 is 632178969561.

The square root of 165969871236 is 407394.

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

165969871236 is a `hidden beast` number, since 1 + 6 + 596 + 9 + 8 + 7 + 1 + 2 + 36 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 137292480900 + 28677390336 = 370530^2 + 169344^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 95329326 + ... + 95331066.

Almost surely, 2^165969871236 is an apocalyptic number.

165969871236 is the 407394-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165969871236

165969871236 is an abundant number, since it is smaller than the sum of its proper divisors (304120726587).

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

165969871236 is an equidigital number, since it uses as much as digits as its factorization.

165969871236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3524 (or 1759 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The spelling of 165969871236 in words is "one hundred sixty-five billion, nine hundred sixty-nine million, eight hundred seventy-one thousand, two hundred thirty-six".