668022073 has 4 divisors (see below), whose sum is σ = 668802420. Its totient is φ = 667241728.

The previous prime is 668022067. The next prime is 668022101. The reversal of 668022073 is 370220866.

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

It can be written as a sum of positive squares in 2 ways, for example, as 276457129 + 391564944 = 16627^2 + 19788^2 .

It is a cyclic number.

It is not a de Polignac number, because 668022073 - 2⁹ = 668021561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668025073) 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, 388888 + ... + 390601.

It is an arithmetic number, because the mean of its divisors is an integer number (167200605).

Almost surely, 2^668022073 is an apocalyptic number.

It is an amenable number.

668022073 is a deficient number, since it is larger than the sum of its proper divisors (780347).

668022073 is an equidigital number, since it uses as much as digits as its factorization.

668022073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780346.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 668022073 is about 25846.1229781180. The cubic root of 668022073 is about 874.1720922167.

The spelling of 668022073 in words is "six hundred sixty-eight million, twenty-two thousand, seventy-three".