66475427593 has 4 divisors (see below), whose sum is σ = 66477258900. Its totient is φ = 66473596288.

The previous prime is 66475427581. The next prime is 66475427633. The reversal of 66475427593 is 39572457466.

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 21919394704 + 44556032889 = 148052^2 + 211083^2 .

It is a cyclic number.

It is not a de Polignac number, because 66475427593 - 2¹³ = 66475419401 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66475422593) 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, 860080 + ... + 934177.

It is an arithmetic number, because the mean of its divisors is an integer number (16619314725).

Almost surely, 2^66475427593 is an apocalyptic number.

It is an amenable number.

66475427593 is a deficient number, since it is larger than the sum of its proper divisors (1831307).

66475427593 is a wasteful number, since it uses less digits than its factorization.

66475427593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831306.

The product of its digits is 38102400, while the sum is 58.

The spelling of 66475427593 in words is "sixty-six billion, four hundred seventy-five million, four hundred twenty-seven thousand, five hundred ninety-three".