63780581997 has 24 divisors (see below), whose sum is σ = 106414663680. Its totient is φ = 36381079680.

The previous prime is 63780581987. The next prime is 63780582071. The reversal of 63780581997 is 79918508736.

It is not a de Polignac number, because 63780581997 - 2⁶ = 63780581933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63780581947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18946797 + ... + 18950162.

It is an arithmetic number, because the mean of its divisors is an integer number (4433944320).

Almost surely, 2^63780581997 is an apocalyptic number.

It is an amenable number.

63780581997 is a deficient number, since it is larger than the sum of its proper divisors (42634081683).

63780581997 is a wasteful number, since it uses less digits than its factorization.

63780581997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37896993 (or 37896990 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 63780581997 in words is "sixty-three billion, seven hundred eighty million, five hundred eighty-one thousand, nine hundred ninety-seven".