765161661 has 16 divisors (see below), whose sum is σ = 1115553600. Its totient is φ = 462654720.

The previous prime is 765161659. The next prime is 765161669. The reversal of 765161661 is 166161567.

It is not a de Polignac number, because 765161661 - 2¹ = 765161659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (765161669) 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, 12486 + ... + 41063.

It is an arithmetic number, because the mean of its divisors is an integer number (69722100).

Almost surely, 2^765161661 is an apocalyptic number.

It is an amenable number.

765161661 is a deficient number, since it is larger than the sum of its proper divisors (350391939).

765161661 is a wasteful number, since it uses less digits than its factorization.

765161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53996.

The product of its digits is 45360, while the sum is 39.

The square root of 765161661 is about 27661.5556503968. Note that the first 3 decimals coincide. The cubic root of 765161661 is about 914.6418461518.

The spelling of 765161661 in words is "seven hundred sixty-five million, one hundred sixty-one thousand, six hundred sixty-one".