13611999786 has 144 divisors (see below), whose sum is σ = 34976914560. Its totient is φ = 3518592000.

The previous prime is 13611999769. The next prime is 13611999803. The reversal of 13611999786 is 68799911631.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13611999769) and next prime (13611999803).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8501386 + ... + 8502986.

It is an arithmetic number, because the mean of its divisors is an integer number (242895240).

Almost surely, 2^13611999786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13611999786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17488457280).

13611999786 is an abundant number, since it is smaller than the sum of its proper divisors (21364914774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13611999786 is a wasteful number, since it uses less digits than its factorization.

13611999786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881 (or 1863 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 60.

The spelling of 13611999786 in words is "thirteen billion, six hundred eleven million, nine hundred ninety-nine thousand, seven hundred eighty-six".