866761258822880 has 48 divisors (see below), whose sum is σ = 2047725889466544. Its totient is φ = 346704094556160.

The previous prime is 866761258822867. The next prime is 866761258822909. The reversal of 866761258822880 is 88228852167668.

It is a super-2 number, since 2×866761258822880² (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 7 ways as a sum of consecutive naturals, for example, 158295344 + ... + 163679376.

It is an arithmetic number, because the mean of its divisors is an integer number (42660956030553).

Almost surely, 2^{866761258822880} is an apocalyptic number.

866761258822880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

866761258822880 is an abundant number, since it is smaller than the sum of its proper divisors (1180964630643664).

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

866761258822880 is a wasteful number, since it uses less digits than its factorization.

866761258822880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6390219 (or 6390211 counting only the distinct ones).

The product of its (nonzero) digits is 1981808640, while the sum is 77.

The spelling of 866761258822880 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, two hundred fifty-eight million, eight hundred twenty-two thousand, eight hundred eighty".