865551379394 has 8 divisors (see below), whose sum is σ = 1398198382140. Its totient is φ = 399485252016.

The previous prime is 865551379369. The next prime is 865551379411. The reversal of 865551379394 is 493973155568.

865551379394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 774465121369 + 91086258025 = 880037^2 + 301805^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×865551379394² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 865551379394.

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, 16645218809 + ... + 16645218860.

Almost surely, 2^865551379394 is an apocalyptic number.

865551379394 is a deficient number, since it is larger than the sum of its proper divisors (532647002746).

865551379394 is a wasteful number, since it uses less digits than its factorization.

865551379394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33290437684.

The product of its digits is 122472000, while the sum is 65.

The spelling of 865551379394 in words is "eight hundred sixty-five billion, five hundred fifty-one million, three hundred seventy-nine thousand, three hundred ninety-four".