866766220131406 has 16 divisors (see below), whose sum is σ = 1516209131426400. Its totient is φ = 371471237198880.

The previous prime is 866766220131401. The next prime is 866766220131433. The reversal of 866766220131406 is 604131022667668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866766220131401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631753804075 + ... + 631753805446.

It is an arithmetic number, because the mean of its divisors is an integer number (94763070714150).

Almost surely, 2^{866766220131406} is an apocalyptic number.

866766220131406 is a deficient number, since it is larger than the sum of its proper divisors (649442911294994).

866766220131406 is a wasteful number, since it uses less digits than its factorization.

866766220131406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263507609544 (or 1263507609530 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 58.

The spelling of 866766220131406 in words is "eight hundred sixty-six trillion, seven hundred sixty-six billion, two hundred twenty million, one hundred thirty-one thousand, four hundred six".