866223215016523 has 16 divisors (see below), whose sum is σ = 1066254967300096. Its totient is φ = 685277223904800.

The previous prime is 866223215016449. The next prime is 866223215016547. The reversal of 866223215016523 is 325610512322668.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866223215016523 is a prime.

It is a super-2 number, since 2×866223215016523² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866223215016023) 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, 597876411 + ... + 599323492.

It is an arithmetic number, because the mean of its divisors is an integer number (66640935456256).

Almost surely, 2^{866223215016523} is an apocalyptic number.

866223215016523 is a deficient number, since it is larger than the sum of its proper divisors (200031752283573).

866223215016523 is a wasteful number, since it uses less digits than its factorization.

866223215016523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197207874.

The product of its (nonzero) digits is 6220800, while the sum is 52.

The spelling of 866223215016523 in words is "eight hundred sixty-six trillion, two hundred twenty-three billion, two hundred fifteen million, sixteen thousand, five hundred twenty-three".