78791557219 has 4 divisors (see below), whose sum is σ = 78891674344. Its totient is φ = 78691440096.

The previous prime is 78791557193. The next prime is 78791557223. The reversal of 78791557219 is 91275519787.

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 78791557219 - 2⁹ = 78791556707 is a prime.

It is a super-2 number, since 2×78791557219² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78791557519) 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, 50057382 + ... + 50058955.

It is an arithmetic number, because the mean of its divisors is an integer number (19722918586).

Almost surely, 2^78791557219 is an apocalyptic number.

78791557219 is a deficient number, since it is larger than the sum of its proper divisors (100117125).

78791557219 is a wasteful number, since it uses less digits than its factorization.

78791557219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100117124.

The product of its digits is 11113200, while the sum is 61.

The spelling of 78791557219 in words is "seventy-eight billion, seven hundred ninety-one million, five hundred fifty-seven thousand, two hundred nineteen".