63640999565 has 16 divisors (see below), whose sum is σ = 89720459136. Its totient is φ = 42724027200.

The previous prime is 63640999561. The next prime is 63640999571. The reversal of 63640999565 is 56599904636.

63640999565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63640999565 - 2² = 63640999561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63640999498 and 63640999507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63640999561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44503481 + ... + 44504910.

It is an arithmetic number, because the mean of its divisors is an integer number (5607528696).

Almost surely, 2^63640999565 is an apocalyptic number.

63640999565 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

63640999565 is a deficient number, since it is larger than the sum of its proper divisors (26079459571).

63640999565 is a wasteful number, since it uses less digits than its factorization.

63640999565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89008420.

The product of its (nonzero) digits is 47239200, while the sum is 62.

The spelling of 63640999565 in words is "sixty-three billion, six hundred forty million, nine hundred ninety-nine thousand, five hundred sixty-five".