78499477585 has 4 divisors (see below), whose sum is σ = 94199373108. Its totient is φ = 62799582064.

The previous prime is 78499477561. The next prime is 78499477591. The reversal of 78499477585 is 58577499487.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8966006721 + 69533470864 = 94689^2 + 263692^2 .

It is a cyclic number.

It is not a de Polignac number, because 78499477585 - 2²⁵ = 78465923153 is a prime.

It is a super-2 number, since 2×78499477585² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7849947754 + ... + 7849947763.

It is an arithmetic number, because the mean of its divisors is an integer number (23549843277).

Almost surely, 2^78499477585 is an apocalyptic number.

It is an amenable number.

78499477585 is a deficient number, since it is larger than the sum of its proper divisors (15699895523).

78499477585 is a wasteful number, since it uses less digits than its factorization.

78499477585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15699895522.

The product of its digits is 711244800, while the sum is 73.

The spelling of 78499477585 in words is "seventy-eight billion, four hundred ninety-nine million, four hundred seventy-seven thousand, five hundred eighty-five".