766474021666 has 8 divisors (see below), whose sum is σ = 1157034033180. Its totient is φ = 380796010608.

The previous prime is 766474021619. The next prime is 766474021673. The reversal of 766474021666 is 666120474667.

766474021666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 766403948025 + 70073641 = 875445^2 + 8371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220499721 + ... + 1220500348.

Almost surely, 2^766474021666 is an apocalyptic number.

766474021666 is a deficient number, since it is larger than the sum of its proper divisors (390560011514).

766474021666 is a wasteful number, since it uses less digits than its factorization.

766474021666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441000228.

The product of its (nonzero) digits is 12192768, while the sum is 55.

The spelling of 766474021666 in words is "seven hundred sixty-six billion, four hundred seventy-four million, twenty-one thousand, six hundred sixty-six".