66428926943 has 4 divisors (see below), whose sum is σ = 66431508000. Its totient is φ = 66426345888.

The previous prime is 66428926931. The next prime is 66428926957. The reversal of 66428926943 is 34962982466.

It is a happy number.

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 66428926943 - 2²⁰ = 66427878367 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 (66428926843) 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, 1251530 + ... + 1303527.

It is an arithmetic number, because the mean of its divisors is an integer number (16607877000).

Almost surely, 2^66428926943 is an apocalyptic number.

66428926943 is a deficient number, since it is larger than the sum of its proper divisors (2581057).

66428926943 is a wasteful number, since it uses less digits than its factorization.

66428926943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581056.

The product of its digits is 26873856, while the sum is 59.

The spelling of 66428926943 in words is "sixty-six billion, four hundred twenty-eight million, nine hundred twenty-six thousand, nine hundred forty-three".