78585661842 has 32 divisors (see below), whose sum is σ = 159725227200. Its totient is φ = 25770590208.

The previous prime is 78585661831. The next prime is 78585661937. The reversal of 78585661842 is 24816658587.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182034 + ... + 436242.

It is an arithmetic number, because the mean of its divisors is an integer number (4991413350).

Almost surely, 2^78585661842 is an apocalyptic number.

78585661842 is an abundant number, since it is smaller than the sum of its proper divisors (81139565358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78585661842 is a wasteful number, since it uses less digits than its factorization.

78585661842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255050.

The product of its digits is 25804800, while the sum is 60.

The spelling of 78585661842 in words is "seventy-eight billion, five hundred eighty-five million, six hundred sixty-one thousand, eight hundred forty-two".