665400240043 has 16 divisors (see below), whose sum is σ = 830466019584. Its totient is φ = 517946124960.

The previous prime is 665400240019. The next prime is 665400240053. The reversal of 665400240043 is 340042004566.

It is a de Polignac number, because none of the positive numbers 2^k-665400240043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665400239990 and 665400240008.

It is not an unprimeable number, because it can be changed into a prime (665400240053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4489680 + ... + 4635517.

It is an arithmetic number, because the mean of its divisors is an integer number (51904126224).

Almost surely, 2^665400240043 is an apocalyptic number.

665400240043 is a deficient number, since it is larger than the sum of its proper divisors (165065779541).

665400240043 is a wasteful number, since it uses less digits than its factorization.

665400240043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9126162.

The product of its (nonzero) digits is 69120, while the sum is 34.

The spelling of 665400240043 in words is "six hundred sixty-five billion, four hundred million, two hundred forty thousand, forty-three".