63785981951 has 24 divisors (see below), whose sum is σ = 68314428000. Its totient is φ = 59484734400.

The previous prime is 63785981891. The next prime is 63785981953. The reversal of 63785981951 is 15918958736.

It is not a de Polignac number, because 63785981951 - 2⁶ = 63785981887 is a prime.

It is a Duffinian number.

Its product of digits (16329600) is a multiple of the sum of its prime divisors (4480).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63785981953) 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, 16691621 + ... + 16695441.

It is an arithmetic number, because the mean of its divisors is an integer number (2846434500).

Almost surely, 2^63785981951 is an apocalyptic number.

63785981951 is a deficient number, since it is larger than the sum of its proper divisors (4528446049).

63785981951 is a wasteful number, since it uses less digits than its factorization.

63785981951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511 (or 4480 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 62.

The spelling of 63785981951 in words is "sixty-three billion, seven hundred eighty-five million, nine hundred eighty-one thousand, nine hundred fifty-one".