63878218919 has 2 divisors, whose sum is σ = 63878218920. Its totient is φ = 63878218918.

The previous prime is 63878218867. The next prime is 63878218931. The reversal of 63878218919 is 91981287836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63878218919 - 2²⁸ = 63609783463 is a prime.

It is a super-2 number, since 2×63878218919² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63878218939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31939109459 + 31939109460.

It is an arithmetic number, because the mean of its divisors is an integer number (31939109460).

Almost surely, 2^63878218919 is an apocalyptic number.

63878218919 is a deficient number, since it is larger than the sum of its proper divisors (1).

63878218919 is an equidigital number, since it uses as much as digits as its factorization.

63878218919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 62.

The spelling of 63878218919 in words is "sixty-three billion, eight hundred seventy-eight million, two hundred eighteen thousand, nine hundred nineteen".