78691668459 has 8 divisors (see below), whose sum is σ = 110444447040. Its totient is φ = 49700001096.

The previous prime is 78691668457. The next prime is 78691668463. The reversal of 78691668459 is 95486619687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78691668459 - 2¹ = 78691668457 is a prime.

It is a super-2 number, since 2×78691668459² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78691668393 and 78691668402.

It is not an unprimeable number, because it can be changed into a prime (78691668457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690277737 + ... + 690277850.

It is an arithmetic number, because the mean of its divisors is an integer number (13805555880).

Almost surely, 2^78691668459 is an apocalyptic number.

78691668459 is a deficient number, since it is larger than the sum of its proper divisors (31752778581).

78691668459 is a wasteful number, since it uses less digits than its factorization.

78691668459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380555609.

The product of its digits is 156764160, while the sum is 69.

The spelling of 78691668459 in words is "seventy-eight billion, six hundred ninety-one million, six hundred sixty-eight thousand, four hundred fifty-nine".