78757843449 has 16 divisors (see below), whose sum is σ = 109813866624. Its totient is φ = 50113430400.

The previous prime is 78757843447. The next prime is 78757843469. The reversal of 78757843449 is 94434875787.

It is not a de Polignac number, because 78757843449 - 2¹ = 78757843447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78757843449.

It is not an unprimeable number, because it can be changed into a prime (78757843447) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1206172 + ... + 1269789.

It is an arithmetic number, because the mean of its divisors is an integer number (6863366664).

Almost surely, 2^78757843449 is an apocalyptic number.

It is an amenable number.

78757843449 is a deficient number, since it is larger than the sum of its proper divisors (31056023175).

78757843449 is a wasteful number, since it uses less digits than its factorization.

78757843449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476448.

The product of its digits is 189665280, while the sum is 66.

The spelling of 78757843449 in words is "seventy-eight billion, seven hundred fifty-seven million, eight hundred forty-three thousand, four hundred forty-nine".