85177368557 has 2 divisors, whose sum is σ = 85177368558. Its totient is φ = 85177368556.

The previous prime is 85177368499. The next prime is 85177368569. The reversal of 85177368557 is 75586377158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73850236516 + 11327132041 = 271754^2 + 106429^2 .

It is a cyclic number.

It is not a de Polignac number, because 85177368557 - 2¹⁴ = 85177352173 is a prime.

It is a super-2 number, since 2×85177368557² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85177368557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85177361557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42588684278 + 42588684279.

It is an arithmetic number, because the mean of its divisors is an integer number (42588684279).

Almost surely, 2^85177368557 is an apocalyptic number.

It is an amenable number.

85177368557 is a deficient number, since it is larger than the sum of its proper divisors (1).

85177368557 is an equidigital number, since it uses as much as digits as its factorization.

85177368557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392000, while the sum is 62.

The spelling of 85177368557 in words is "eighty-five billion, one hundred seventy-seven million, three hundred sixty-eight thousand, five hundred fifty-seven".