78749665549 has 8 divisors (see below), whose sum is σ = 80441736768. Its totient is φ = 77073786720.

The previous prime is 78749665513. The next prime is 78749665571. The reversal of 78749665549 is 94556694787.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78749665549 - 2³³ = 70159730957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78749665949) 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, 4038267 + ... + 4057720.

It is an arithmetic number, because the mean of its divisors is an integer number (10055217096).

Almost surely, 2^78749665549 is an apocalyptic number.

It is an amenable number.

78749665549 is a deficient number, since it is larger than the sum of its proper divisors (1692071219).

78749665549 is a wasteful number, since it uses less digits than its factorization.

78749665549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8096195.

The product of its digits is 457228800, while the sum is 70.

The spelling of 78749665549 in words is "seventy-eight billion, seven hundred forty-nine million, six hundred sixty-five thousand, five hundred forty-nine".