1993661108 has 12 divisors (see below), whose sum is σ = 3672533760. Its totient is φ = 944365752.

The previous prime is 1993661101. The next prime is 1993661149. The reversal of 1993661108 is 8011663991.

It is a happy number.

It is a super-2 number, since 2×1993661108² = 7949369227103575328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993661101) 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, 13116116 + ... + 13116267.

It is an arithmetic number, because the mean of its divisors is an integer number (306044480).

Almost surely, 2^1993661108 is an apocalyptic number.

It is an amenable number.

1993661108 is a deficient number, since it is larger than the sum of its proper divisors (1678872652).

1993661108 is a wasteful number, since it uses less digits than its factorization.

1993661108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26232406 (or 26232404 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1993661108 is about 44650.4323383324. The cubic root of 1993661108 is about 1258.5885572366.

The spelling of 1993661108 in words is "one billion, nine hundred ninety-three million, six hundred sixty-one thousand, one hundred eight".