18778851347 has 8 divisors (see below), whose sum is σ = 19062624960. Its totient is φ = 18495794880.

The previous prime is 18778851337. The next prime is 18778851349. The reversal of 18778851347 is 74315887781.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18778851347 - 2²⁴ = 18762074131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18778851349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126404 + ... + 231377.

It is an arithmetic number, because the mean of its divisors is an integer number (2382828120).

Almost surely, 2^18778851347 is an apocalyptic number.

18778851347 is a deficient number, since it is larger than the sum of its proper divisors (283773613).

18778851347 is an equidigital number, since it uses as much as digits as its factorization.

18778851347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358573.

The product of its digits is 10536960, while the sum is 59.

The spelling of 18778851347 in words is "eighteen billion, seven hundred seventy-eight million, eight hundred fifty-one thousand, three hundred forty-seven".