63878513801 has 4 divisors (see below), whose sum is σ = 66655840512. Its totient is φ = 61101187092.

The previous prime is 63878513791. The next prime is 63878513813. The reversal of 63878513801 is 10831587836.

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 a de Polignac number, because none of the positive numbers 2^k-63878513801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63878513801.

It is not an unprimeable number, because it can be changed into a prime (63878513891) 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, 1388663321 + ... + 1388663366.

It is an arithmetic number, because the mean of its divisors is an integer number (16663960128).

Almost surely, 2^63878513801 is an apocalyptic number.

It is an amenable number.

63878513801 is a deficient number, since it is larger than the sum of its proper divisors (2777326711).

63878513801 is a wasteful number, since it uses less digits than its factorization.

63878513801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777326710.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 63878513801 in words is "sixty-three billion, eight hundred seventy-eight million, five hundred thirteen thousand, eight hundred one".