85841981979 has 32 divisors (see below), whose sum is σ = 126723293760. Its totient is φ = 51344658432.

The previous prime is 85841981917. The next prime is 85841981987. The reversal of 85841981979 is 97918914858.

It is not a de Polignac number, because 85841981979 - 2⁸ = 85841981723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85841981989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1379367 + ... + 1440255.

It is an arithmetic number, because the mean of its divisors is an integer number (3960102930).

Almost surely, 2^85841981979 is an apocalyptic number.

85841981979 is a deficient number, since it is larger than the sum of its proper divisors (40881311781).

85841981979 is a wasteful number, since it uses less digits than its factorization.

85841981979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61919.

The product of its digits is 52254720, while the sum is 69.

The spelling of 85841981979 in words is "eighty-five billion, eight hundred forty-one million, nine hundred eighty-one thousand, nine hundred seventy-nine".