878744738561667 has 32 divisors (see below), whose sum is σ = 1293331887974400. Its totient is φ = 528518328129792.

The previous prime is 878744738561639. The next prime is 878744738561681. The reversal of 878744738561667 is 766165837447878.

It is a happy number.

It is not a de Polignac number, because 878744738561667 - 2⁶ = 878744738561603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (87).

It is not an unprimeable number, because it can be changed into a prime (878744738561467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3641016403 + ... + 3641257740.

It is an arithmetic number, because the mean of its divisors is an integer number (40416621499200).

Almost surely, 2^{878744738561667} is an apocalyptic number.

878744738561667 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

878744738561667 is a deficient number, since it is larger than the sum of its proper divisors (414587149412733).

878744738561667 is a wasteful number, since it uses less digits than its factorization.

878744738561667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7282274267.

The product of its digits is 63727534080, while the sum is 87.

The spelling of 878744738561667 in words is "eight hundred seventy-eight trillion, seven hundred forty-four billion, seven hundred thirty-eight million, five hundred sixty-one thousand, six hundred sixty-seven".