66373871722 has 4 divisors (see below), whose sum is σ = 99560807586. Its totient is φ = 33186935860.

The previous prime is 66373871719. The next prime is 66373871723. The reversal of 66373871722 is 22717837366.

It is a happy number.

66373871722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 45475989001 + 20897882721 = 213251^2 + 144561^2 .

It is a super-2 number, since 2×66373871722² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66373871722.

It is not an unprimeable number, because it can be changed into a prime (66373871723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16593467929 + ... + 16593467932.

Almost surely, 2^66373871722 is an apocalyptic number.

66373871722 is a deficient number, since it is larger than the sum of its proper divisors (33186935864).

66373871722 is a wasteful number, since it uses less digits than its factorization.

66373871722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33186935863.

The product of its digits is 3556224, while the sum is 52.

The spelling of 66373871722 in words is "sixty-six billion, three hundred seventy-three million, eight hundred seventy-one thousand, seven hundred twenty-two".