84399639251 has 2 divisors, whose sum is σ = 84399639252. Its totient is φ = 84399639250.

The previous prime is 84399639229. The next prime is 84399639277. The reversal of 84399639251 is 15293699348.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84399639251 - 2¹⁰ = 84399638227 is a prime.

It is not a weakly prime, because it can be changed into another prime (84399639221) 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 as a sum of consecutive naturals, namely, 42199819625 + 42199819626.

It is an arithmetic number, because the mean of its divisors is an integer number (42199819626).

Almost surely, 2^84399639251 is an apocalyptic number.

84399639251 is a deficient number, since it is larger than the sum of its proper divisors (1).

84399639251 is an equidigital number, since it uses as much as digits as its factorization.

84399639251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12597120, while the sum is 59.

The spelling of 84399639251 in words is "eighty-four billion, three hundred ninety-nine million, six hundred thirty-nine thousand, two hundred fifty-one".