161265786 has 16 divisors (see below), whose sum is σ = 351852768. Its totient is φ = 48868400.

The previous prime is 161265773. The next prime is 161265889. The reversal of 161265786 is 687562161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1221645 + ... + 1221776.

It is an arithmetic number, because the mean of its divisors is an integer number (21990798).

Almost surely, 2^161265786 is an apocalyptic number.

161265786 is an abundant number, since it is smaller than the sum of its proper divisors (190586982).

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

161265786 is a wasteful number, since it uses less digits than its factorization.

161265786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443437.

The product of its digits is 120960, while the sum is 42.

The square root of 161265786 is about 12699.0466571314. The cubic root of 161265786 is about 544.3113778400.

It can be divided in two parts, 16126 and 5786, that added together give a palindrome (21912).

The spelling of 161265786 in words is "one hundred sixty-one million, two hundred sixty-five thousand, seven hundred eighty-six".