2666715221 has 8 divisors (see below), whose sum is σ = 2706672000. Its totient is φ = 2627024400.

The previous prime is 2666715211. The next prime is 2666715253. The reversal of 2666715221 is 1225176662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2666715221 - 2⁶ = 2666715157 is a prime.

It is a super-2 number, since 2×2666715221² = 14222740139826157682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666715211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46241 + ... + 86438.

It is an arithmetic number, because the mean of its divisors is an integer number (338334000).

Almost surely, 2^2666715221 is an apocalyptic number.

It is an amenable number.

2666715221 is a deficient number, since it is larger than the sum of its proper divisors (39956779).

2666715221 is a wasteful number, since it uses less digits than its factorization.

2666715221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132979.

The product of its digits is 60480, while the sum is 38.

The square root of 2666715221 is about 51640.2480726032. The cubic root of 2666715221 is about 1386.7309650738.

The spelling of 2666715221 in words is "two billion, six hundred sixty-six million, seven hundred fifteen thousand, two hundred twenty-one".