3666972228321 has 4 divisors (see below), whose sum is σ = 4889296304432. Its totient is φ = 2444648152212.

The previous prime is 3666972228307. The next prime is 3666972228373. The reversal of 3666972228321 is 1238222796663.

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 not a de Polignac number, because 3666972228321 - 2¹⁷ = 3666972097249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3666972208321) 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, 611162038051 + ... + 611162038056.

It is an arithmetic number, because the mean of its divisors is an integer number (1222324076108).

Almost surely, 2^{3666972228321} is an apocalyptic number.

It is an amenable number.

3666972228321 is a deficient number, since it is larger than the sum of its proper divisors (1222324076111).

3666972228321 is a wasteful number, since it uses less digits than its factorization.

3666972228321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222324076110.

The product of its digits is 15676416, while the sum is 57.

The spelling of 3666972228321 in words is "three trillion, six hundred sixty-six billion, nine hundred seventy-two million, two hundred twenty-eight thousand, three hundred twenty-one".