18712077847 has 4 divisors (see below), whose sum is σ = 18794510136. Its totient is φ = 18629645560.

The previous prime is 18712077841. The next prime is 18712077911. The reversal of 18712077847 is 74877021781.

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 18712077847 - 2⁷ = 18712077719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18712077794 and 18712077803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18712077841) 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, 41215804 + ... + 41216257.

It is an arithmetic number, because the mean of its divisors is an integer number (4698627534).

Almost surely, 2^18712077847 is an apocalyptic number.

18712077847 is a deficient number, since it is larger than the sum of its proper divisors (82432289).

18712077847 is an equidigital number, since it uses as much as digits as its factorization.

18712077847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82432288.

The product of its (nonzero) digits is 1229312, while the sum is 52.

The spelling of 18712077847 in words is "eighteen billion, seven hundred twelve million, seventy-seven thousand, eight hundred forty-seven".