867851640605 has 4 divisors (see below), whose sum is σ = 1041421968732. Its totient is φ = 694281312480.

The previous prime is 867851640583. The next prime is 867851640701. The reversal of 867851640605 is 506046158768.

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

It can be written as a sum of positive squares in 2 ways, for example, as 269832458116 + 598019182489 = 519454^2 + 773317^2 .

It is not a de Polignac number, because 867851640605 - 2¹⁸ = 867851378461 is a prime.

It is a super-3 number, since 3×867851640605³ (a number of 37 digits) contains 333 as substring.

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, 86785164056 + ... + 86785164065.

It is an arithmetic number, because the mean of its divisors is an integer number (260355492183).

Almost surely, 2^867851640605 is an apocalyptic number.

It is an amenable number.

867851640605 is a deficient number, since it is larger than the sum of its proper divisors (173570328127).

867851640605 is a wasteful number, since it uses less digits than its factorization.

867851640605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173570328126.

The product of its (nonzero) digits is 9676800, while the sum is 56.

The spelling of 867851640605 in words is "eight hundred sixty-seven billion, eight hundred fifty-one million, six hundred forty thousand, six hundred five".