2666693898864 has 240 divisors, whose sum is σ = 8062240215744. Its totient is φ = 819753984000.

The previous prime is 2666693898833. The next prime is 2666693898871. The reversal of 2666693898864 is 4688983966662.

It is a happy number.

It is a super-2 number, since 2×2666693898864² (a number of 26 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39239314 + ... + 39307214.

Almost surely, 2^{2666693898864} is an apocalyptic number.

2666693898864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2666693898864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4031120107872).

2666693898864 is an abundant number, since it is smaller than the sum of its proper divisors (5395546316880).

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

2666693898864 is a wasteful number, since it uses less digits than its factorization.

2666693898864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68256 (or 68247 counting only the distinct ones).

The product of its digits is 7739670528, while the sum is 81.

The spelling of 2666693898864 in words is "two trillion, six hundred sixty-six billion, six hundred ninety-three million, eight hundred ninety-eight thousand, eight hundred sixty-four".