85577531129 has 4 divisors (see below), whose sum is σ = 89298293376. Its totient is φ = 81856768884.

The previous prime is 85577531101. The next prime is 85577531141. The reversal of 85577531129 is 92113577558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85577531129 - 2⁸ = 85577530873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85577531159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1860381089 + ... + 1860381134.

It is an arithmetic number, because the mean of its divisors is an integer number (22324573344).

Almost surely, 2^85577531129 is an apocalyptic number.

It is an amenable number.

85577531129 is a deficient number, since it is larger than the sum of its proper divisors (3720762247).

85577531129 is a wasteful number, since it uses less digits than its factorization.

85577531129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720762246.

The product of its digits is 2646000, while the sum is 53.

The spelling of 85577531129 in words is "eighty-five billion, five hundred seventy-seven million, five hundred thirty-one thousand, one hundred twenty-nine".