78943699634987 has 4 divisors (see below), whose sum is σ = 86120399601816. Its totient is φ = 71766999668160.

The previous prime is 78943699634983. The next prime is 78943699635023.

78943699634987 is nontrivially palindromic in base 10.

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 78943699634987 - 2² = 78943699634983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78943699634896 and 78943699634905.

It is not an unprimeable number, because it can be changed into a prime (78943699634983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3588349983398 + ... + 3588349983419.

It is an arithmetic number, because the mean of its divisors is an integer number (21530099900454).

Almost surely, 2^{78943699634987} is an apocalyptic number.

78943699634987 is a deficient number, since it is larger than the sum of its proper divisors (7176699966829).

78943699634987 is a wasteful number, since it uses less digits than its factorization.

78943699634987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7176699966828.

The product of its digits is 106662334464, while the sum is 92.

The spelling of 78943699634987 in words is "seventy-eight trillion, nine hundred forty-three billion, six hundred ninety-nine million, six hundred thirty-four thousand, nine hundred eighty-seven".