66175422397 has 4 divisors (see below), whose sum is σ = 75629054176. Its totient is φ = 56721790620.

The previous prime is 66175422347. The next prime is 66175422409. The reversal of 66175422397 is 79322457166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66175422397 - 2³⁵ = 31815684029 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 (66175422307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4726815879 + ... + 4726815892.

It is an arithmetic number, because the mean of its divisors is an integer number (18907263544).

Almost surely, 2^66175422397 is an apocalyptic number.

It is an amenable number.

66175422397 is a deficient number, since it is larger than the sum of its proper divisors (9453631779).

66175422397 is an equidigital number, since it uses as much as digits as its factorization.

66175422397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9453631778.

The product of its digits is 3810240, while the sum is 52.

The spelling of 66175422397 in words is "sixty-six billion, one hundred seventy-five million, four hundred twenty-two thousand, three hundred ninety-seven".