3645899897 has 4 divisors (see below), whose sum is σ = 3646601316. Its totient is φ = 3645198480.

The previous prime is 3645899893. The next prime is 3645900047. The reversal of 3645899897 is 7989985463.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3464970496 + 180929401 = 58864^2 + 13451^2 .

It is a cyclic number.

It is not a de Polignac number, because 3645899897 - 2² = 3645899893 is a prime.

It is a super-2 number, since 2×3645899897² = 26585172117889221218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3645899893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342854 + ... + 353327.

It is an arithmetic number, because the mean of its divisors is an integer number (911650329).

Almost surely, 2^3645899897 is an apocalyptic number.

It is an amenable number.

3645899897 is a deficient number, since it is larger than the sum of its proper divisors (701419).

3645899897 is an equidigital number, since it uses as much as digits as its factorization.

3645899897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701418.

The product of its digits is 117573120, while the sum is 68.

The square root of 3645899897 is about 60381.2876394666. The cubic root of 3645899897 is about 1539.1049919766.

The spelling of 3645899897 in words is "three billion, six hundred forty-five million, eight hundred ninety-nine thousand, eight hundred ninety-seven".