666019682497 has 24 divisors (see below), whose sum is σ = 744375082920. Its totient is φ = 592354944000.

The previous prime is 666019682441. The next prime is 666019682513. The reversal of 666019682497 is 794286910666.

It is a happy number.

666019682497 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 4 ways, for example, as 308464716816 + 357554965681 = 555396^2 + 597959^2 .

It is a de Polignac number, because none of the positive numbers 2^k-666019682497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666019682407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2744497 + ... + 2977297.

It is an arithmetic number, because the mean of its divisors is an integer number (31015628455).

Almost surely, 2^666019682497 is an apocalyptic number.

It is an amenable number.

666019682497 is a deficient number, since it is larger than the sum of its proper divisors (78355400423).

666019682497 is a wasteful number, since it uses less digits than its factorization.

666019682497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233105 (or 233074 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 64.

The spelling of 666019682497 in words is "six hundred sixty-six billion, nineteen million, six hundred eighty-two thousand, four hundred ninety-seven".