6618693581997 has 16 divisors (see below), whose sum is σ = 10089273372672. Its totient is φ = 3780743721840.

The previous prime is 6618693581987. The next prime is 6618693581999. The reversal of 6618693581997 is 7991853968166.

It is not a de Polignac number, because 6618693581997 - 2¹² = 6618693577901 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 56894529 + ... + 57010742.

It is an arithmetic number, because the mean of its divisors is an integer number (630579585792).

Almost surely, 2^{6618693581997} is an apocalyptic number.

It is an amenable number.

6618693581997 is a deficient number, since it is larger than the sum of its proper divisors (3470579790675).

6618693581997 is a wasteful number, since it uses less digits than its factorization.

6618693581997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113908048.

The product of its digits is 1058158080, while the sum is 78.

The spelling of 6618693581997 in words is "six trillion, six hundred eighteen billion, six hundred ninety-three million, five hundred eighty-one thousand, nine hundred ninety-seven".