63897228691 has 2 divisors, whose sum is σ = 63897228692. Its totient is φ = 63897228690.

The previous prime is 63897228679. The next prime is 63897228701. The reversal of 63897228691 is 19682279836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63897228691 - 2¹⁷ = 63897097619 is a prime.

It is not a weakly prime, because it can be changed into another prime (63897228491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31948614345 + 31948614346.

It is an arithmetic number, because the mean of its divisors is an integer number (31948614346).

Almost surely, 2^63897228691 is an apocalyptic number.

63897228691 is a deficient number, since it is larger than the sum of its proper divisors (1).

63897228691 is an equidigital number, since it uses as much as digits as its factorization.

63897228691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 61.

The spelling of 63897228691 in words is "sixty-three billion, eight hundred ninety-seven million, two hundred twenty-eight thousand, six hundred ninety-one".