2668721671 has 24 divisors (see below), whose sum is σ = 3498227712. Its totient is φ = 1989094800.

The previous prime is 2668721669. The next prime is 2668721677. The reversal of 2668721671 is 1761278662.

It is a happy number.

2668721671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2668721671 - 2¹ = 2668721669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2668721677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49015 + ... + 87976.

It is an arithmetic number, because the mean of its divisors is an integer number (145759488).

Almost surely, 2^2668721671 is an apocalyptic number.

2668721671 is a deficient number, since it is larger than the sum of its proper divisors (829506041).

2668721671 is a wasteful number, since it uses less digits than its factorization.

2668721671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137043 (or 137032 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 2668721671 is about 51659.6716114224. The cubic root of 2668721671 is about 1387.0786723433.

The spelling of 2668721671 in words is "two billion, six hundred sixty-eight million, seven hundred twenty-one thousand, six hundred seventy-one".