665043452351 has 4 divisors (see below), whose sum is σ = 677591442072. Its totient is φ = 652495462632.

The previous prime is 665043452327. The next prime is 665043452417. The reversal of 665043452351 is 153254340566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 153254340566 = 2 ⋅76627170283.

It is a de Polignac number, because none of the positive numbers 2^k-665043452351 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 (665043452551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6273994781 + ... + 6273994886.

It is an arithmetic number, because the mean of its divisors is an integer number (169397860518).

Almost surely, 2^665043452351 is an apocalyptic number.

665043452351 is a deficient number, since it is larger than the sum of its proper divisors (12547989721).

665043452351 is a wasteful number, since it uses less digits than its factorization.

665043452351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12547989720.

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 665043452351 in words is "six hundred sixty-five billion, forty-three million, four hundred fifty-two thousand, three hundred fifty-one".