6666703973 has 4 divisors (see below), whose sum is σ = 6684577548. Its totient is φ = 6648830400.

The previous prime is 6666703949. The next prime is 6666704027. The reversal of 6666703973 is 3793076666.

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 3969252004 + 2697451969 = 63002^2 + 51937^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666703973 - 2⁶ = 6666703909 is a prime.

It is a super-2 number, since 2×6666703973² = 88889883727227969458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666703913) 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, 8936228 + ... + 8936973.

It is an arithmetic number, because the mean of its divisors is an integer number (1671144387).

Almost surely, 2^6666703973 is an apocalyptic number.

It is an amenable number.

6666703973 is a deficient number, since it is larger than the sum of its proper divisors (17873575).

6666703973 is a wasteful number, since it uses less digits than its factorization.

6666703973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17873574.

The product of its (nonzero) digits is 5143824, while the sum is 53.

The square root of 6666703973 is about 81649.8865461551. The cubic root of 6666703973 is about 1882.0755684159.

The spelling of 6666703973 in words is "six billion, six hundred sixty-six million, seven hundred three thousand, nine hundred seventy-three".