1818948566638 has 8 divisors (see below), whose sum is σ = 3118197542832. Its totient is φ = 779549385696.

The previous prime is 1818948566609. The next prime is 1818948566639. The reversal of 1818948566638 is 8366658498181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818948566639) 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, 64962448795 + ... + 64962448822.

It is an arithmetic number, because the mean of its divisors is an integer number (389774692854).

Almost surely, 2^{1818948566638} is an apocalyptic number.

1818948566638 is a deficient number, since it is larger than the sum of its proper divisors (1299248976194).

1818948566638 is a wasteful number, since it uses less digits than its factorization.

1818948566638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129924897626.

The product of its digits is 477757440, while the sum is 73.

The spelling of 1818948566638 in words is "one trillion, eight hundred eighteen billion, nine hundred forty-eight million, five hundred sixty-six thousand, six hundred thirty-eight".