66972427966 has 4 divisors (see below), whose sum is σ = 100458641952. Its totient is φ = 33486213982.

The previous prime is 66972427909. The next prime is 66972427969.

66972427966 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×66972427966² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66972427898 and 66972427907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66972427969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16743106990 + ... + 16743106993.

It is an arithmetic number, because the mean of its divisors is an integer number (25114660488).

Almost surely, 2^66972427966 is an apocalyptic number.

66972427966 is a deficient number, since it is larger than the sum of its proper divisors (33486213986).

66972427966 is a wasteful number, since it uses less digits than its factorization.

66972427966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33486213985.

The product of its digits is 82301184, while the sum is 64.

The spelling of 66972427966 in words is "sixty-six billion, nine hundred seventy-two million, four hundred twenty-seven thousand, nine hundred sixty-six".