78508861859155 has 64 divisors (see below), whose sum is σ = 123462165657600. Its totient is φ = 47532933157248.

The previous prime is 78508861859123. The next prime is 78508861859159. The reversal of 78508861859155 is 55195816880587.

It is not a de Polignac number, because 78508861859155 - 2⁵ = 78508861859123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78508861859159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 76038657 + ... + 77064226.

It is an arithmetic number, because the mean of its divisors is an integer number (1929096338400).

Almost surely, 2^{78508861859155} is an apocalyptic number.

78508861859155 is a deficient number, since it is larger than the sum of its proper divisors (44953303798445).

78508861859155 is a wasteful number, since it uses less digits than its factorization.

78508861859155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153102945 (or 153102931 counting only the distinct ones).

The product of its (nonzero) digits is 967680000, while the sum is 76.

The spelling of 78508861859155 in words is "seventy-eight trillion, five hundred eight billion, eight hundred sixty-one million, eight hundred fifty-nine thousand, one hundred fifty-five".