63949121771 has 2 divisors, whose sum is σ = 63949121772. Its totient is φ = 63949121770.

The previous prime is 63949121737. The next prime is 63949121861. The reversal of 63949121771 is 17712194936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63949121771 - 2¹⁸ = 63948859627 is a prime.

It is not a weakly prime, because it can be changed into another prime (63949121671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31974560885 + 31974560886.

It is an arithmetic number, because the mean of its divisors is an integer number (31974560886).

Almost surely, 2^63949121771 is an apocalyptic number.

63949121771 is a deficient number, since it is larger than the sum of its proper divisors (1).

63949121771 is an equidigital number, since it uses as much as digits as its factorization.

63949121771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 50.

The spelling of 63949121771 in words is "sixty-three billion, nine hundred forty-nine million, one hundred twenty-one thousand, seven hundred seventy-one".