866221145380623 has 16 divisors (see below), whose sum is σ = 1159664706300672. Its totient is φ = 575132345424000.

The previous prime is 866221145380621. The next prime is 866221145380627. The reversal of 866221145380623 is 326083541122668.

It is not a de Polignac number, because 866221145380623 - 2¹ = 866221145380621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866221145380621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395331738 + ... + 397516823.

It is an arithmetic number, because the mean of its divisors is an integer number (72479044143792).

Almost surely, 2^{866221145380623} is an apocalyptic number.

866221145380623 is a deficient number, since it is larger than the sum of its proper divisors (293443560920049).

866221145380623 is a wasteful number, since it uses less digits than its factorization.

866221145380623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792850046.

The product of its (nonzero) digits is 19906560, while the sum is 57.

The spelling of 866221145380623 in words is "eight hundred sixty-six trillion, two hundred twenty-one billion, one hundred forty-five million, three hundred eighty thousand, six hundred twenty-three".