64815412639 has 4 divisors (see below), whose sum is σ = 64815928056. Its totient is φ = 64814897224.

The previous prime is 64815412631. The next prime is 64815412679. The reversal of 64815412639 is 93621451846.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 64815412639 - 2³ = 64815412631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64815412592 and 64815412601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64815412631) 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, 68892 + ... + 366574.

It is an arithmetic number, because the mean of its divisors is an integer number (16203982014).

Almost surely, 2^64815412639 is an apocalyptic number.

64815412639 is a deficient number, since it is larger than the sum of its proper divisors (515417).

64815412639 is a wasteful number, since it uses less digits than its factorization.

64815412639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515416.

The product of its digits is 1244160, while the sum is 49.

The spelling of 64815412639 in words is "sixty-four billion, eight hundred fifteen million, four hundred twelve thousand, six hundred thirty-nine".