78786953593 has 4 divisors (see below), whose sum is σ = 78962426100. Its totient is φ = 78611481088.

The previous prime is 78786953579. The next prime is 78786953633. The reversal of 78786953593 is 39535968787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39535968787 = 7 ⋅5647995541.

It can be written as a sum of positive squares in 2 ways, for example, as 18367838784 + 60419114809 = 135528^2 + 245803^2 .

It is a cyclic number.

It is not a de Polignac number, because 78786953593 - 2³³ = 70197019001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78786953503) 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, 87735580 + ... + 87736477.

It is an arithmetic number, because the mean of its divisors is an integer number (19740606525).

Almost surely, 2^78786953593 is an apocalyptic number.

It is an amenable number.

78786953593 is a deficient number, since it is larger than the sum of its proper divisors (175472507).

78786953593 is a wasteful number, since it uses less digits than its factorization.

78786953593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175472506.

The product of its digits is 342921600, while the sum is 70.

The spelling of 78786953593 in words is "seventy-eight billion, seven hundred eighty-six million, nine hundred fifty-three thousand, five hundred ninety-three".