63215735985 has 320 divisors, whose sum is σ = 131098176000. Its totient is φ = 28970016768.

The previous prime is 63215735971. The next prime is 63215735987. The reversal of 63215735985 is 58953751236.

63215735985 is a `hidden beast` number, since 6 + 32 + 15 + 7 + 3 + 598 + 5 = 666.

It is not a de Polignac number, because 63215735985 - 2⁷ = 63215735857 is a prime.

It is a super-2 number, since 2×63215735985² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63215735987) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 317666916 + ... + 317667114.

It is an arithmetic number, because the mean of its divisors is an integer number (409681800).

Almost surely, 2^63215735985 is an apocalyptic number.

It is an amenable number.

63215735985 is an abundant number, since it is smaller than the sum of its proper divisors (67882440015).

63215735985 is a wasteful number, since it uses less digits than its factorization.

63215735985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 333 counting only the distinct ones).

The product of its digits is 6804000, while the sum is 54.

The spelling of 63215735985 in words is "sixty-three billion, two hundred fifteen million, seven hundred thirty-five thousand, nine hundred eighty-five".