63434338661 has 2 divisors, whose sum is σ = 63434338662. Its totient is φ = 63434338660.

The previous prime is 63434338637. The next prime is 63434338673. The reversal of 63434338661 is 16683343436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46098666436 + 17335672225 = 214706^2 + 131665^2 .

It is a cyclic number.

It is not a de Polignac number, because 63434338661 - 2²² = 63430144357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63434338601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31717169330 + 31717169331.

It is an arithmetic number, because the mean of its divisors is an integer number (31717169331).

Almost surely, 2^63434338661 is an apocalyptic number.

It is an amenable number.

63434338661 is a deficient number, since it is larger than the sum of its proper divisors (1).

63434338661 is an equidigital number, since it uses as much as digits as its factorization.

63434338661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 47.

The spelling of 63434338661 in words is "sixty-three billion, four hundred thirty-four million, three hundred thirty-eight thousand, six hundred sixty-one".