63999526368261 has 16 divisors (see below), whose sum is σ = 93091138260480. Its totient is φ = 38787209201520.

The previous prime is 63999526368247. The next prime is 63999526368263. The reversal of 63999526368261 is 16286362599936.

It is not a de Polignac number, because 63999526368261 - 2⁵ = 63999526368229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63999526368263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6148465 + ... + 12876438.

It is an arithmetic number, because the mean of its divisors is an integer number (5818196141280).

Almost surely, 2^{63999526368261} is an apocalyptic number.

It is an amenable number.

63999526368261 is a deficient number, since it is larger than the sum of its proper divisors (29091611892219).

63999526368261 is a wasteful number, since it uses less digits than its factorization.

63999526368261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19126856.

The product of its digits is 1360488960, while the sum is 75.

The spelling of 63999526368261 in words is "sixty-three trillion, nine hundred ninety-nine billion, five hundred twenty-six million, three hundred sixty-eight thousand, two hundred sixty-one".