165472781 has 16 divisors (see below), whose sum is σ = 179340480. Its totient is φ = 152106240.

The previous prime is 165472763. The next prime is 165472789. The reversal of 165472781 is 187274561.

It is a cyclic number.

It is not a de Polignac number, because 165472781 - 2¹⁸ = 165210637 is a prime.

It is a super-2 number, since 2×165472781² = 54762482503747922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165472789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148655 + ... + 149763.

It is an arithmetic number, because the mean of its divisors is an integer number (11208780).

Almost surely, 2^165472781 is an apocalyptic number.

It is an amenable number.

165472781 is a deficient number, since it is larger than the sum of its proper divisors (13867699).

165472781 is a wasteful number, since it uses less digits than its factorization.

165472781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324.

The product of its digits is 94080, while the sum is 41.

The square root of 165472781 is about 12863.6223902912. The cubic root of 165472781 is about 549.0040167677.

The spelling of 165472781 in words is "one hundred sixty-five million, four hundred seventy-two thousand, seven hundred eighty-one".