3723407681721 has 64 divisors (see below), whose sum is σ = 6141138984960. Its totient is φ = 1954067431680.

The previous prime is 3723407681701. The next prime is 3723407681723. The reversal of 3723407681721 is 1271867043273.

It is a happy number.

3723407681721 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 3723407681721 - 2⁵ = 3723407681689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3723407681723) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 76379871 + ... + 76428603.

It is an arithmetic number, because the mean of its divisors is an integer number (95955296640).

Almost surely, 2^{3723407681721} is an apocalyptic number.

It is an amenable number.

3723407681721 is a deficient number, since it is larger than the sum of its proper divisors (2417731303239).

3723407681721 is a wasteful number, since it uses less digits than its factorization.

3723407681721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50166.

The product of its (nonzero) digits is 2370816, while the sum is 51.

The spelling of 3723407681721 in words is "three trillion, seven hundred twenty-three billion, four hundred seven million, six hundred eighty-one thousand, seven hundred twenty-one".