866786514023640 has 96 divisors (see below), whose sum is σ = 3024908038756080. Its totient is φ = 198122631775488.

The previous prime is 866786514023627. The next prime is 866786514023641. The reversal of 866786514023640 is 46320415687668.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786514023641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73706330347 + ... + 73706342106.

Almost surely, 2^{866786514023640} is an apocalyptic number.

It is an amenable number.

866786514023640 is an abundant number, since it is smaller than the sum of its proper divisors (2158121524732440).

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

866786514023640 is a wasteful number, since it uses less digits than its factorization.

866786514023640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147412672481 (or 147412672470 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 66.

The spelling of 866786514023640 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred fourteen million, twenty-three thousand, six hundred forty".