766668733686 has 12 divisors (see below), whose sum is σ = 1661115589692. Its totient is φ = 255556244556.

The previous prime is 766668733681. The next prime is 766668733729. The reversal of 766668733686 is 686337866667.

It is a super-2 number, since 2×766668733686² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766668733681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21296353696 + ... + 21296353731.

It is an arithmetic number, because the mean of its divisors is an integer number (138426299141).

Almost surely, 2^766668733686 is an apocalyptic number.

766668733686 is an abundant number, since it is smaller than the sum of its proper divisors (894446856006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

766668733686 is a wasteful number, since it uses less digits than its factorization.

766668733686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42592707435 (or 42592707432 counting only the distinct ones).

The product of its digits is 1316818944, while the sum is 72.

The spelling of 766668733686 in words is "seven hundred sixty-six billion, six hundred sixty-eight million, seven hundred thirty-three thousand, six hundred eighty-six".