766481646640 has 20 divisors (see below), whose sum is σ = 1782069828624. Its totient is φ = 306592658624.

The previous prime is 766481646599. The next prime is 766481646641. The reversal of 766481646640 is 46646184667.

766481646640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×766481646640² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (766481646641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4790510212 + ... + 4790510371.

Almost surely, 2^766481646640 is an apocalyptic number.

It is an amenable number.

766481646640 is an abundant number, since it is smaller than the sum of its proper divisors (1015588181984).

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

766481646640 is a wasteful number, since it uses less digits than its factorization.

766481646640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9581020596 (or 9581020590 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 58.

The spelling of 766481646640 in words is "seven hundred sixty-six billion, four hundred eighty-one million, six hundred forty-six thousand, six hundred forty".