84725672557 has 2 divisors, whose sum is σ = 84725672558. Its totient is φ = 84725672556.

The previous prime is 84725672533. The next prime is 84725672567. The reversal of 84725672557 is 75527652748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77428071081 + 7297601476 = 278259^2 + 85426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84725672557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84725672527) 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, 42362836278 + 42362836279.

It is an arithmetic number, because the mean of its divisors is an integer number (42362836279).

Almost surely, 2^84725672557 is an apocalyptic number.

It is an amenable number.

84725672557 is a deficient number, since it is larger than the sum of its proper divisors (1).

84725672557 is an equidigital number, since it uses as much as digits as its factorization.

84725672557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928000, while the sum is 58.

The spelling of 84725672557 in words is "eighty-four billion, seven hundred twenty-five million, six hundred seventy-two thousand, five hundred fifty-seven".