66749700943 has 4 divisors (see below), whose sum is σ = 67689837648. Its totient is φ = 65809564240.

The previous prime is 66749700937. The next prime is 66749700977. The reversal of 66749700943 is 34900794766.

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

It is a cyclic number.

It is not a de Polignac number, because 66749700943 - 2⁵ = 66749700911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66749700923) 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, 470068246 + ... + 470068387.

It is an arithmetic number, because the mean of its divisors is an integer number (16922459412).

Almost surely, 2^66749700943 is an apocalyptic number.

66749700943 is a deficient number, since it is larger than the sum of its proper divisors (940136705).

66749700943 is an equidigital number, since it uses as much as digits as its factorization.

66749700943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940136704.

The product of its (nonzero) digits is 6858432, while the sum is 55.

The spelling of 66749700943 in words is "sixty-six billion, seven hundred forty-nine million, seven hundred thousand, nine hundred forty-three".