85555577837 has 2 divisors, whose sum is σ = 85555577838. Its totient is φ = 85555577836.

The previous prime is 85555577753. The next prime is 85555577879. The reversal of 85555577837 is 73877555558.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85120396516 + 435181321 = 291754^2 + 20861^2 .

It is a cyclic number.

It is not a de Polignac number, because 85555577837 - 2²⁰ = 85554529261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85555577897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42777788918 + 42777788919.

It is an arithmetic number, because the mean of its divisors is an integer number (42777788919).

Almost surely, 2^85555577837 is an apocalyptic number.

It is an amenable number.

85555577837 is a deficient number, since it is larger than the sum of its proper divisors (1).

85555577837 is an equidigital number, since it uses as much as digits as its factorization.

85555577837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 205800000, while the sum is 65.

The spelling of 85555577837 in words is "eighty-five billion, five hundred fifty-five million, five hundred seventy-seven thousand, eight hundred thirty-seven".