3662441721 has 12 divisors (see below), whose sum is σ = 5291330148. Its totient is φ = 2441103264.

The previous prime is 3662441701. The next prime is 3662441723. The reversal of 3662441721 is 1271442663.

3662441721 is a `hidden beast` number, since 3 + 6 + 624 + 4 + 1 + 7 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 485541225 + 3176900496 = 22035^2 + 56364^2 .

It is not a de Polignac number, because 3662441721 - 2¹⁰ = 3662440697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3662441723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3151 + ... + 85643.

It is an arithmetic number, because the mean of its divisors is an integer number (440944179).

Almost surely, 2^3662441721 is an apocalyptic number.

It is an amenable number.

3662441721 is a deficient number, since it is larger than the sum of its proper divisors (1628888427).

3662441721 is a wasteful number, since it uses less digits than its factorization.

3662441721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87432 (or 87429 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 3662441721 is about 60518.1106859756. The cubic root of 3662441721 is about 1541.4291732114.

The spelling of 3662441721 in words is "three billion, six hundred sixty-two million, four hundred forty-one thousand, seven hundred twenty-one".