2401668721 has 8 divisors (see below), whose sum is σ = 2421082664. Its totient is φ = 2382307200.

The previous prime is 2401668629. The next prime is 2401668733. The reversal of 2401668721 is 1278661042.

2401668721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 486643600 + 1915025121 = 22060^2 + 43761^2 .

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 2401668721 - 2⁹ = 2401668209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2401668781) 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, 81631 + ... + 107083.

It is an arithmetic number, because the mean of its divisors is an integer number (302635333).

Almost surely, 2^2401668721 is an apocalyptic number.

It is an amenable number.

2401668721 is a deficient number, since it is larger than the sum of its proper divisors (19413943).

2401668721 is a wasteful number, since it uses less digits than its factorization.

2401668721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26211.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 2401668721 is about 49006.8232086105. The cubic root of 2401668721 is about 1339.1761329465.

The spelling of 2401668721 in words is "two billion, four hundred one million, six hundred sixty-eight thousand, seven hundred twenty-one".