866513800778846 has 32 divisors (see below), whose sum is σ = 1418170078211040. Its totient is φ = 393803691840000.

The previous prime is 866513800778771. The next prime is 866513800778897. The reversal of 866513800778846 is 648877008315668.

It is a super-2 number, since 2×866513800778846² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3271101170 + ... + 3271366058.

It is an arithmetic number, because the mean of its divisors is an integer number (44317814944095).

Almost surely, 2^{866513800778846} is an apocalyptic number.

866513800778846 is a deficient number, since it is larger than the sum of its proper divisors (551656277432194).

866513800778846 is a wasteful number, since it uses less digits than its factorization.

866513800778846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289340.

The product of its (nonzero) digits is 2601123840, while the sum is 77.

The spelling of 866513800778846 in words is "eight hundred sixty-six trillion, five hundred thirteen billion, eight hundred million, seven hundred seventy-eight thousand, eight hundred forty-six".