63778625732447 has 16 divisors (see below), whose sum is σ = 64785686700000. Its totient is φ = 62781512379264.

The previous prime is 63778625732443. The next prime is 63778625732453. The reversal of 63778625732447 is 74423752687736.

It is a cyclic number.

It is not a de Polignac number, because 63778625732447 - 2² = 63778625732443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63778625732441) 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, 4713929 + ... + 12238397.

It is an arithmetic number, because the mean of its divisors is an integer number (4049105418750).

Almost surely, 2^{63778625732447} is an apocalyptic number.

63778625732447 is a deficient number, since it is larger than the sum of its proper divisors (1007060967553).

63778625732447 is a wasteful number, since it uses less digits than its factorization.

63778625732447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7525130.

The product of its digits is 1991485440, while the sum is 71.

The spelling of 63778625732447 in words is "sixty-three trillion, seven hundred seventy-eight billion, six hundred twenty-five million, seven hundred thirty-two thousand, four hundred forty-seven".