161975766 has 16 divisors (see below), whose sum is σ = 324633600. Its totient is φ = 53878248.

The previous prime is 161975747. The next prime is 161975767. The reversal of 161975766 is 667579161.

It is a super-2 number, since 2×161975766² = 52472297542573512, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161975767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25306 + ... + 31053.

It is an arithmetic number, because the mean of its divisors is an integer number (20289600).

Almost surely, 2^161975766 is an apocalyptic number.

161975766 is an abundant number, since it is smaller than the sum of its proper divisors (162657834).

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

161975766 is a wasteful number, since it uses less digits than its factorization.

161975766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56843.

The product of its digits is 476280, while the sum is 48.

The square root of 161975766 is about 12726.9700243224. The cubic root of 161975766 is about 545.1089937160.

The spelling of 161975766 in words is "one hundred sixty-one million, nine hundred seventy-five thousand, seven hundred sixty-six".