2660858221 has 24 divisors (see below), whose sum is σ = 3177316800. Its totient is φ = 2220523200.

The previous prime is 2660858203. The next prime is 2660858227. The reversal of 2660858221 is 1228580662.

It is not a de Polignac number, because 2660858221 - 2¹³ = 2660850029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660858227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1266630 + ... + 1268728.

It is an arithmetic number, because the mean of its divisors is an integer number (132388200).

Almost surely, 2^2660858221 is an apocalyptic number.

It is an amenable number.

2660858221 is a deficient number, since it is larger than the sum of its proper divisors (516458579).

2660858221 is a wasteful number, since it uses less digits than its factorization.

2660858221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785 (or 2778 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 2660858221 is about 51583.5072576497. The cubic root of 2660858221 is about 1385.7149789727.

The spelling of 2660858221 in words is "two billion, six hundred sixty million, eight hundred fifty-eight thousand, two hundred twenty-one".