85644661255 has 4 divisors (see below), whose sum is σ = 102773593512. Its totient is φ = 68515729000.

The previous prime is 85644661177. The next prime is 85644661303. The reversal of 85644661255 is 55216644658.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 85644661255 - 2⁹ = 85644660743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8564466121 + ... + 8564466130.

It is an arithmetic number, because the mean of its divisors is an integer number (25693398378).

Almost surely, 2^85644661255 is an apocalyptic number.

85644661255 is a deficient number, since it is larger than the sum of its proper divisors (17128932257).

85644661255 is a wasteful number, since it uses less digits than its factorization.

85644661255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17128932256.

The product of its digits is 6912000, while the sum is 52.

The spelling of 85644661255 in words is "eighty-five billion, six hundred forty-four million, six hundred sixty-one thousand, two hundred fifty-five".