867615868681 has 9 divisors (see below), whose sum is σ = 875468039719. Its totient is φ = 859833528736.

The previous prime is 867615868667. The next prime is 867615868687. The reversal of 867615868681 is 186868516768.

The square root of 867615868681 is 931459.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15288086025 + 852327782656 = 123645^2 + 923216^2 .

It is not a de Polignac number, because 867615868681 - 2⁹ = 867615868169 is a prime.

It is a super-2 number, since 2×867615868681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 867615868681.

It is not an unprimeable number, because it can be changed into a prime (867615868687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 105250746 + ... + 105258988.

Almost surely, 2^867615868681 is an apocalyptic number.

867615868681 is the 931459-th square number.

867615868681 is the 465730-th centered octagonal number.

It is an amenable number.

867615868681 is a deficient number, since it is larger than the sum of its proper divisors (7852171038).

867615868681 is an frugal number, since it uses more digits than its factorization.

867615868681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16712 (or 8356 counting only the distinct ones).

The product of its digits is 185794560, while the sum is 70.

The spelling of 867615868681 in words is "eight hundred sixty-seven billion, six hundred fifteen million, eight hundred sixty-eight thousand, six hundred eighty-one".