84427872457 has 2 divisors, whose sum is σ = 84427872458. Its totient is φ = 84427872456.

The previous prime is 84427872443. The next prime is 84427872479. The reversal of 84427872457 is 75427872448.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82681551936 + 1746320521 = 287544^2 + 41789^2 .

It is a cyclic number.

It is not a de Polignac number, because 84427872457 - 2⁷ = 84427872329 is a prime.

It is not a weakly prime, because it can be changed into another prime (84427872257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42213936228 + 42213936229.

It is an arithmetic number, because the mean of its divisors is an integer number (42213936229).

Almost surely, 2^84427872457 is an apocalyptic number.

It is an amenable number.

84427872457 is a deficient number, since it is larger than the sum of its proper divisors (1).

84427872457 is an equidigital number, since it uses as much as digits as its factorization.

84427872457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28098560, while the sum is 58.

Subtracting from 84427872457 its reverse (75427872448), we obtain a palindrome (9000000009).

The spelling of 84427872457 in words is "eighty-four billion, four hundred twenty-seven million, eight hundred seventy-two thousand, four hundred fifty-seven".