665146780807 has 8 divisors (see below), whose sum is σ = 676067966480. Its totient is φ = 654226148160.

The previous prime is 665146780799. The next prime is 665146780817. The reversal of 665146780807 is 708087641566.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 665146780807 - 2³ = 665146780799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665146780817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2792803 + ... + 3021595.

It is an arithmetic number, because the mean of its divisors is an integer number (84508495810).

Almost surely, 2^665146780807 is an apocalyptic number.

665146780807 is a deficient number, since it is larger than the sum of its proper divisors (10921185673).

665146780807 is a wasteful number, since it uses less digits than its factorization.

665146780807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276513.

The product of its (nonzero) digits is 13547520, while the sum is 58.

The spelling of 665146780807 in words is "six hundred sixty-five billion, one hundred forty-six million, seven hundred eighty thousand, eight hundred seven".