84865881564831 has 4 divisors (see below), whose sum is σ = 113154508753112. Its totient is φ = 56577254376552.

The previous prime is 84865881564781. The next prime is 84865881564839. The reversal of 84865881564831 is 13846518856848.

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

It is not a de Polignac number, because 84865881564831 - 2⁷ = 84865881564703 is a prime.

It is a super-2 number, since 2×84865881564831² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84865881564839) 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, 14144313594136 + ... + 14144313594141.

It is an arithmetic number, because the mean of its divisors is an integer number (28288627188278).

Almost surely, 2^{84865881564831} is an apocalyptic number.

84865881564831 is a deficient number, since it is larger than the sum of its proper divisors (28288627188281).

84865881564831 is a wasteful number, since it uses less digits than its factorization.

84865881564831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28288627188280.

The product of its digits is 1415577600, while the sum is 75.

The spelling of 84865881564831 in words is "eighty-four trillion, eight hundred sixty-five billion, eight hundred eighty-one million, five hundred sixty-four thousand, eight hundred thirty-one".