64635613441 has 4 divisors (see below), whose sum is σ = 73869272512. Its totient is φ = 55401954372.

The previous prime is 64635613421. The next prime is 64635613451. The reversal of 64635613441 is 14431653646.

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 64635613441 - 2¹³ = 64635605249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64635613421) 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, 4616829525 + ... + 4616829538.

It is an arithmetic number, because the mean of its divisors is an integer number (18467318128).

Almost surely, 2^64635613441 is an apocalyptic number.

It is an amenable number.

64635613441 is a deficient number, since it is larger than the sum of its proper divisors (9233659071).

64635613441 is an equidigital number, since it uses as much as digits as its factorization.

64635613441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9233659070.

The product of its digits is 622080, while the sum is 43.

The spelling of 64635613441 in words is "sixty-four billion, six hundred thirty-five million, six hundred thirteen thousand, four hundred forty-one".