866158405322406 has 32 divisors (see below), whose sum is σ = 2048059283523840. Its totient is φ = 238940249743776.

The previous prime is 866158405322383. The next prime is 866158405322423. The reversal of 866158405322406 is 604223504851668.

It is a super-2 number, since 2×866158405322406² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866158405322406.

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, 355565846616 + ... + 355565849051.

It is an arithmetic number, because the mean of its divisors is an integer number (64001852610120).

Almost surely, 2^{866158405322406} is an apocalyptic number.

866158405322406 is an abundant number, since it is smaller than the sum of its proper divisors (1181900878201434).

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

866158405322406 is a wasteful number, since it uses less digits than its factorization.

866158405322406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711131695708.

The product of its (nonzero) digits is 66355200, while the sum is 60.

The spelling of 866158405322406 in words is "eight hundred sixty-six trillion, one hundred fifty-eight billion, four hundred five million, three hundred twenty-two thousand, four hundred six".