85958312781 has 32 divisors (see below), whose sum is σ = 131811499008. Its totient is φ = 49317143040.

The previous prime is 85958312749. The next prime is 85958312801. The reversal of 85958312781 is 18721385958.

It is not a de Polignac number, because 85958312781 - 2⁵ = 85958312749 is a prime.

It is a super-2 number, since 2×85958312781² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85958312381) 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, 510151 + ... + 657396.

It is an arithmetic number, because the mean of its divisors is an integer number (4119109344).

Almost surely, 2^85958312781 is an apocalyptic number.

It is an amenable number.

85958312781 is a deficient number, since it is larger than the sum of its proper divisors (45853186227).

85958312781 is a wasteful number, since it uses less digits than its factorization.

85958312781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167681.

The product of its digits is 4838400, while the sum is 57.

The spelling of 85958312781 in words is "eighty-five billion, nine hundred fifty-eight million, three hundred twelve thousand, seven hundred eighty-one".