666983603787 has 16 divisors (see below), whose sum is σ = 902796385920. Its totient is φ = 437916390912.

The previous prime is 666983603731. The next prime is 666983603789. The reversal of 666983603787 is 787306389666.

It is a happy number.

666983603787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666983603787 - 2²² = 666979409483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666983603789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475248 + ... + 1248930.

It is an arithmetic number, because the mean of its divisors is an integer number (56424774120).

Almost surely, 2^666983603787 is an apocalyptic number.

666983603787 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

666983603787 is a deficient number, since it is larger than the sum of its proper divisors (235812782133).

666983603787 is a wasteful number, since it uses less digits than its factorization.

666983603787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778042.

The product of its (nonzero) digits is 329204736, while the sum is 69.

The spelling of 666983603787 in words is "six hundred sixty-six billion, nine hundred eighty-three million, six hundred three thousand, seven hundred eighty-seven".