78199687045 has 4 divisors (see below), whose sum is σ = 93839624460. Its totient is φ = 62559749632.

The previous prime is 78199687021. The next prime is 78199687051. The reversal of 78199687045 is 54078699187.

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 18795861604 + 59403825441 = 137098^2 + 243729^2 .

It is a cyclic number.

It is not a de Polignac number, because 78199687045 - 2²⁵ = 78166132613 is a prime.

It is a super-2 number, since 2×78199687045² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7819968700 + ... + 7819968709.

It is an arithmetic number, because the mean of its divisors is an integer number (23459906115).

Almost surely, 2^78199687045 is an apocalyptic number.

It is an amenable number.

78199687045 is a deficient number, since it is larger than the sum of its proper divisors (15639937415).

78199687045 is a wasteful number, since it uses less digits than its factorization.

78199687045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15639937414.

The product of its (nonzero) digits is 30481920, while the sum is 64.

The spelling of 78199687045 in words is "seventy-eight billion, one hundred ninety-nine million, six hundred eighty-seven thousand, forty-five".