766662774407 has 4 divisors (see below), whose sum is σ = 766699332720. Its totient is φ = 766626216096.

The previous prime is 766662774391. The next prime is 766662774413. The reversal of 766662774407 is 704477266667.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704477266667 = 273899 ⋅2572033.

It is a cyclic number.

It is not a de Polignac number, because 766662774407 - 2⁴ = 766662774391 is a prime.

It is a super-2 number, since 2×766662774407² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 766662774407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766662774457) 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, 18247682 + ... + 18289647.

It is an arithmetic number, because the mean of its divisors is an integer number (191674833180).

Almost surely, 2^766662774407 is an apocalyptic number.

766662774407 is a deficient number, since it is larger than the sum of its proper divisors (36558313).

766662774407 is a wasteful number, since it uses less digits than its factorization.

766662774407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36558312.

The product of its (nonzero) digits is 99574272, while the sum is 62.

The spelling of 766662774407 in words is "seven hundred sixty-six billion, six hundred sixty-two million, seven hundred seventy-four thousand, four hundred seven".