63897766435 has 4 divisors (see below), whose sum is σ = 76677319728. Its totient is φ = 51118213144.

The previous prime is 63897766417. The next prime is 63897766447. The reversal of 63897766435 is 53466779836.

63897766435 is digitally balanced in base 11, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 63897766435 - 2³⁵ = 29538028067 is a prime.

It is a Duffinian number.

63897766435 is strictly pandigital in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6389776639 + ... + 6389776648.

It is an arithmetic number, because the mean of its divisors is an integer number (19169329932).

Almost surely, 2^63897766435 is an apocalyptic number.

63897766435 is a deficient number, since it is larger than the sum of its proper divisors (12779553293).

63897766435 is a wasteful number, since it uses less digits than its factorization.

63897766435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12779553292.

The product of its digits is 137168640, while the sum is 64.

The spelling of 63897766435 in words is "sixty-three billion, eight hundred ninety-seven million, seven hundred sixty-six thousand, four hundred thirty-five".