665858385747 has 12 divisors (see below), whose sum is σ = 961845528384. Its totient is φ = 443882475600.

The previous prime is 665858385737. The next prime is 665858385767. The reversal of 665858385747 is 747583858566.

665858385747 is a `hidden beast` number, since 6 + 6 + 585 + 8 + 38 + 5 + 7 + 4 + 7 = 666.

It is not a de Polignac number, because 665858385747 - 2¹⁸ = 665858123603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665858385707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1742883 + ... + 2090300.

It is an arithmetic number, because the mean of its divisors is an integer number (80153794032).

Almost surely, 2^665858385747 is an apocalyptic number.

665858385747 is a deficient number, since it is larger than the sum of its proper divisors (295987142637).

665858385747 is a wasteful number, since it uses less digits than its factorization.

665858385747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852490 (or 3852487 counting only the distinct ones).

The product of its digits is 1354752000, while the sum is 72.

The spelling of 665858385747 in words is "six hundred sixty-five billion, eight hundred fifty-eight million, three hundred eighty-five thousand, seven hundred forty-seven".