878780864102399 has 4 divisors (see below), whose sum is σ = 879141463556664. Its totient is φ = 878420264648136.

The previous prime is 878780864102389. The next prime is 878780864102411. The reversal of 878780864102399 is 993201468087878.

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

It is a cyclic number.

It is not a de Polignac number, because 878780864102399 - 2²⁸ = 878780595666943 is a prime.

It is a super-2 number, since 2×878780864102399² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878780864102359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180299723477 + ... + 180299728350.

It is an arithmetic number, because the mean of its divisors is an integer number (219785365889166).

Almost surely, 2^{878780864102399} is an apocalyptic number.

878780864102399 is a deficient number, since it is larger than the sum of its proper divisors (360599454265).

878780864102399 is a wasteful number, since it uses less digits than its factorization.

878780864102399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360599454264.

The product of its (nonzero) digits is 2341011456, while the sum is 80.

The spelling of 878780864102399 in words is "eight hundred seventy-eight trillion, seven hundred eighty billion, eight hundred sixty-four million, one hundred two thousand, three hundred ninety-nine".