63943489771 has 6 divisors (see below), whose sum is σ = 74383243260. Its totient is φ = 54808705476.

The previous prime is 63943489763. The next prime is 63943489847. The reversal of 63943489771 is 17798434936.

It is not a de Polignac number, because 63943489771 - 2³ = 63943489763 is a prime.

It is the 252871-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63943489171) by changing a digit.

It is a nontrivial repunit in base 252870.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 652484541 + ... + 652484638.

It is an arithmetic number, because the mean of its divisors is an integer number (12397207210).

Almost surely, 2^63943489771 is an apocalyptic number.

63943489771 is a deficient number, since it is larger than the sum of its proper divisors (10439753489).

63943489771 is a wasteful number, since it uses less digits than its factorization.

63943489771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304969193 (or 1304969186 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 61.

The spelling of 63943489771 in words is "sixty-three billion, nine hundred forty-three million, four hundred eighty-nine thousand, seven hundred seventy-one".