85247137212557 has 2 divisors, whose sum is σ = 85247137212558. Its totient is φ = 85247137212556.

The previous prime is 85247137212493. The next prime is 85247137212563. The reversal of 85247137212557 is 75521273174258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80590945744516 + 4656191468041 = 8977246^2 + 2157821^2 .

It is a cyclic number.

It is not a de Polignac number, because 85247137212557 - 2⁶ = 85247137212493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85247137212496 and 85247137212505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85247137215557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42623568606278 + 42623568606279.

It is an arithmetic number, because the mean of its divisors is an integer number (42623568606279).

Almost surely, 2^{85247137212557} is an apocalyptic number.

It is an amenable number.

85247137212557 is a deficient number, since it is larger than the sum of its proper divisors (1).

85247137212557 is an equidigital number, since it uses as much as digits as its factorization.

85247137212557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32928000, while the sum is 59.

The spelling of 85247137212557 in words is "eighty-five trillion, two hundred forty-seven billion, one hundred thirty-seven million, two hundred twelve thousand, five hundred fifty-seven".