666730792405 has 4 divisors (see below), whose sum is σ = 800076950892. Its totient is φ = 533384633920.

The previous prime is 666730792397. The next prime is 666730792457. The reversal of 666730792405 is 504297037666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 224185204324 + 442545588081 = 473482^2 + 665241^2 .

It is not a de Polignac number, because 666730792405 - 2³ = 666730792397 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 66673079236 + ... + 66673079245.

It is an arithmetic number, because the mean of its divisors is an integer number (200019237723).

Almost surely, 2^666730792405 is an apocalyptic number.

It is an amenable number.

666730792405 is a deficient number, since it is larger than the sum of its proper divisors (133346158487).

666730792405 is a wasteful number, since it uses less digits than its factorization.

666730792405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133346158486.

The product of its (nonzero) digits is 11430720, while the sum is 55.

The spelling of 666730792405 in words is "six hundred sixty-six billion, seven hundred thirty million, seven hundred ninety-two thousand, four hundred five".