78947555919 has 4 divisors (see below), whose sum is σ = 105263407896. Its totient is φ = 52631703944.

The previous prime is 78947555903. The next prime is 78947555957. The reversal of 78947555919 is 91955574987.

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 78947555919 - 2⁴ = 78947555903 is a prime.

It is a super-2 number, since 2×78947555919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78947555989) 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, 13157925984 + ... + 13157925989.

It is an arithmetic number, because the mean of its divisors is an integer number (26315851974).

Almost surely, 2^78947555919 is an apocalyptic number.

78947555919 is a deficient number, since it is larger than the sum of its proper divisors (26315851977).

78947555919 is a wasteful number, since it uses less digits than its factorization.

78947555919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26315851976.

The product of its digits is 142884000, while the sum is 69.

The spelling of 78947555919 in words is "seventy-eight billion, nine hundred forty-seven million, five hundred fifty-five thousand, nine hundred nineteen".