667743340745 has 96 divisors (see below), whose sum is σ = 935782878240. Its totient is φ = 454373867520.

The previous prime is 667743340741. The next prime is 667743340769. The reversal of 667743340745 is 547043347766.

It is a happy number.

667743340745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 102094947529 + 565648393216 = 319523^2 + 752096^2 .

It is not a de Polignac number, because 667743340745 - 2² = 667743340741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667743340741) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 393483737 + ... + 393485433.

It is an arithmetic number, because the mean of its divisors is an integer number (9747738315).

Almost surely, 2^667743340745 is an apocalyptic number.

667743340745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

667743340745 is a deficient number, since it is larger than the sum of its proper divisors (268039537495).

667743340745 is a wasteful number, since it uses less digits than its factorization.

667743340745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203 (or 2184 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 56.

The spelling of 667743340745 in words is "six hundred sixty-seven billion, seven hundred forty-three million, three hundred forty thousand, seven hundred forty-five".