18441978147 has 6 divisors (see below), whose sum is σ = 26638412892. Its totient is φ = 12294652092.

The previous prime is 18441978127. The next prime is 18441978253. The reversal of 18441978147 is 74187914481.

18441978147 is a `hidden beast` number, since 1 + 84 + 419 + 7 + 8 + 147 = 666.

It is not a de Polignac number, because 18441978147 - 2¹⁶ = 18441912611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18441978093 and 18441978102.

It is not an unprimeable number, because it can be changed into a prime (18441978127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1024554333 + ... + 1024554350.

It is an arithmetic number, because the mean of its divisors is an integer number (4439735482).

Almost surely, 2^18441978147 is an apocalyptic number.

18441978147 is a deficient number, since it is larger than the sum of its proper divisors (8196434745).

18441978147 is a wasteful number, since it uses less digits than its factorization.

18441978147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049108689 (or 2049108686 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The spelling of 18441978147 in words is "eighteen billion, four hundred forty-one million, nine hundred seventy-eight thousand, one hundred forty-seven".