63989991039381 has 32 divisors (see below), whose sum is σ = 93608157202560. Its totient is φ = 38560439500800.

The previous prime is 63989991039347. The next prime is 63989991039391. The reversal of 63989991039381 is 18393019998936.

It is not a de Polignac number, because 63989991039381 - 2²³ = 63989982650773 is a prime.

It is a super-2 number, since 2×63989991039381² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63989991039297 and 63989991039306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63989991039311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9371671 + ... + 14690411.

It is an arithmetic number, because the mean of its divisors is an integer number (2925254912580).

Almost surely, 2^{63989991039381} is an apocalyptic number.

It is an amenable number.

63989991039381 is a deficient number, since it is larger than the sum of its proper divisors (29618166163179).

63989991039381 is a wasteful number, since it uses less digits than its factorization.

63989991039381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320837.

The product of its (nonzero) digits is 612220032, while the sum is 78.

The spelling of 63989991039381 in words is "sixty-three trillion, nine hundred eighty-nine billion, nine hundred ninety-one million, thirty-nine thousand, three hundred eighty-one".