765066881 has 4 divisors (see below), whose sum is σ = 766884564. Its totient is φ = 763249200.

The previous prime is 765066877. The next prime is 765066931. The reversal of 765066881 is 188660567.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74218225 + 690848656 = 8615^2 + 26284^2 .

It is a cyclic number.

It is not a de Polignac number, because 765066881 - 2² = 765066877 is a prime.

It is a super-2 number, since 2×765066881² = 1170654664806136322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765066821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908210 + ... + 909051.

It is an arithmetic number, because the mean of its divisors is an integer number (191721141).

Almost surely, 2^765066881 is an apocalyptic number.

It is an amenable number.

765066881 is a deficient number, since it is larger than the sum of its proper divisors (1817683).

765066881 is a wasteful number, since it uses less digits than its factorization.

765066881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817682.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 765066881 is about 27659.8423892834. The cubic root of 765066881 is about 914.6040792596.

The spelling of 765066881 in words is "seven hundred sixty-five million, sixty-six thousand, eight hundred eighty-one".