766533681 has 12 divisors (see below), whose sum is σ = 1108591120. Its totient is φ = 510387480.

The previous prime is 766533631. The next prime is 766533697. The reversal of 766533681 is 186335667.

It is not a de Polignac number, because 766533681 - 2¹³ = 766525489 is a prime.

It is a super-2 number, since 2×766533681² = 1175147768214819522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (766533601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45211 + ... + 59808.

Almost surely, 2^766533681 is an apocalyptic number.

It is an amenable number.

766533681 is a deficient number, since it is larger than the sum of its proper divisors (342057439).

766533681 is a wasteful number, since it uses less digits than its factorization.

766533681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105836 (or 105833 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 766533681 is about 27686.3446666403. The cubic root of 766533681 is about 915.1882045897.

The spelling of 766533681 in words is "seven hundred sixty-six million, five hundred thirty-three thousand, six hundred eighty-one".