6618693581998 has 4 divisors (see below), whose sum is σ = 9928040373000. Its totient is φ = 3309346790998.

The previous prime is 6618693581987. The next prime is 6618693581999. The reversal of 6618693581998 is 8991853968166.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618693581999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1654673395498 + ... + 1654673395501.

It is an arithmetic number, because the mean of its divisors is an integer number (2482010093250).

Almost surely, 2^{6618693581998} is an apocalyptic number.

6618693581998 is a deficient number, since it is larger than the sum of its proper divisors (3309346791002).

6618693581998 is a wasteful number, since it uses less digits than its factorization.

6618693581998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309346791001.

The product of its digits is 1209323520, while the sum is 79.

The spelling of 6618693581998 in words is "six trillion, six hundred eighteen billion, six hundred ninety-three million, five hundred eighty-one thousand, nine hundred ninety-eight".