840561164389 has 8 divisors (see below), whose sum is σ = 841235738112. Its totient is φ = 839886724800.

The previous prime is 840561164357. The next prime is 840561164393. The reversal of 840561164389 is 983461165048.

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

It is a cyclic number.

It is not a de Polignac number, because 840561164389 - 2⁵ = 840561164357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840561164329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15226812 + ... + 15281914.

It is an arithmetic number, because the mean of its divisors is an integer number (105154467264).

Almost surely, 2^840561164389 is an apocalyptic number.

It is an amenable number.

840561164389 is a deficient number, since it is larger than the sum of its proper divisors (674573723).

840561164389 is a wasteful number, since it uses less digits than its factorization.

840561164389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67067.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 840561164389 in words is "eight hundred forty billion, five hundred sixty-one million, one hundred sixty-four thousand, three hundred eighty-nine".