78609155619 has 4 divisors (see below), whose sum is σ = 104812207496. Its totient is φ = 52406103744.

The previous prime is 78609155591. The next prime is 78609155621. The reversal of 78609155619 is 91655190687.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78609155619 - 2²⁸ = 78340720163 is a prime.

It is a super-2 number, since 2×78609155619² (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 (78609155519) 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, 13101525934 + ... + 13101525939.

It is an arithmetic number, because the mean of its divisors is an integer number (26203051874).

Almost surely, 2^78609155619 is an apocalyptic number.

78609155619 is a deficient number, since it is larger than the sum of its proper divisors (26203051877).

78609155619 is a wasteful number, since it uses less digits than its factorization.

78609155619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26203051876.

The product of its (nonzero) digits is 4082400, while the sum is 57.

The spelling of 78609155619 in words is "seventy-eight billion, six hundred nine million, one hundred fifty-five thousand, six hundred nineteen".