63353425991 has 4 divisors (see below), whose sum is σ = 64006554192. Its totient is φ = 62700297792.

The previous prime is 63353425969. The next prime is 63353426011. The reversal of 63353425991 is 19952435336.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63353425991 is a prime.

It is a super-2 number, since 2×63353425991² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63353425591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326563955 + ... + 326564148.

It is an arithmetic number, because the mean of its divisors is an integer number (16001638548).

Almost surely, 2^63353425991 is an apocalyptic number.

63353425991 is a deficient number, since it is larger than the sum of its proper divisors (653128201).

63353425991 is an equidigital number, since it uses as much as digits as its factorization.

63353425991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653128200.

The product of its digits is 2624400, while the sum is 50.

The spelling of 63353425991 in words is "sixty-three billion, three hundred fifty-three million, four hundred twenty-five thousand, nine hundred ninety-one".