665126052043 has 4 divisors (see below), whose sum is σ = 665571549888. Its totient is φ = 664680554200.

The previous prime is 665126052001. The next prime is 665126052047. The reversal of 665126052043 is 340250621566.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665126052043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665126051987 and 665126052005.

It is not an unprimeable number, because it can be changed into a prime (665126052047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222746683 + ... + 222749668.

It is an arithmetic number, because the mean of its divisors is an integer number (166392887472).

Almost surely, 2^665126052043 is an apocalyptic number.

665126052043 is a deficient number, since it is larger than the sum of its proper divisors (445497845).

665126052043 is a wasteful number, since it uses less digits than its factorization.

665126052043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445497844.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 665126052043 in words is "six hundred sixty-five billion, one hundred twenty-six million, fifty-two thousand, forty-three".