3645938993 has 4 divisors (see below), whose sum is σ = 3651010560. Its totient is φ = 3640867428.

The previous prime is 3645938971. The next prime is 3645939007. The reversal of 3645938993 is 3998395463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3645938993 - 2³⁰ = 2572197169 is a prime.

It is a super-2 number, since 2×3645938993² = 26585742281355708098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3645938293) 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, 2534705 + ... + 2536142.

It is an arithmetic number, because the mean of its divisors is an integer number (912752640).

Almost surely, 2^3645938993 is an apocalyptic number.

It is an amenable number.

3645938993 is a deficient number, since it is larger than the sum of its proper divisors (5071567).

3645938993 is an equidigital number, since it uses as much as digits as its factorization.

3645938993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071566.

The product of its digits is 18895680, while the sum is 59.

The square root of 3645938993 is about 60381.6113812806. The cubic root of 3645938993 is about 1539.1104933741.

The spelling of 3645938993 in words is "three billion, six hundred forty-five million, nine hundred thirty-eight thousand, nine hundred ninety-three".