3723666217 has 4 divisors (see below), whose sum is σ = 3724812756. Its totient is φ = 3722519680.

The previous prime is 3723666143. The next prime is 3723666229. The reversal of 3723666217 is 7126663273.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7126663273 = 27011 ⋅263843.

It can be written as a sum of positive squares in 2 ways, for example, as 2558741056 + 1164925161 = 50584^2 + 34131^2 .

It is a cyclic number.

It is not a de Polignac number, because 3723666217 - 2¹⁵ = 3723633449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3723666017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568384 + ... + 574897.

It is an arithmetic number, because the mean of its divisors is an integer number (931203189).

Almost surely, 2^3723666217 is an apocalyptic number.

It is an amenable number.

3723666217 is a deficient number, since it is larger than the sum of its proper divisors (1146539).

3723666217 is a wasteful number, since it uses less digits than its factorization.

3723666217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146538.

The product of its digits is 381024, while the sum is 43.

The square root of 3723666217 is about 61021.8503242896. The cubic root of 3723666217 is about 1549.9710319942.

The spelling of 3723666217 in words is "three billion, seven hundred twenty-three million, six hundred sixty-six thousand, two hundred seventeen".