866274940637401 has 9 divisors (see below), whose sum is σ = 866880172409853. Its totient is φ = 865670131188000.

The previous prime is 866274940637399. The next prime is 866274940637413. The reversal of 866274940637401 is 104736049472668.

The square root of 866274940637401 is 29432549.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 234495656189001 + 631779284448400 = 15313251^2 + 25135220^2 .

It is not a de Polignac number, because 866274940637401 - 2¹ = 866274940637399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866274940637201) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 45591008901 + ... + 45591027901.

Almost surely, 2^{866274940637401} is an apocalyptic number.

866274940637401 is the 29432549-th square number.

866274940637401 is the 14716275-th centered octagonal number.

It is an amenable number.

866274940637401 is a deficient number, since it is larger than the sum of its proper divisors (605231772452).

866274940637401 is an frugal number, since it uses more digits than its factorization.

866274940637401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41100 (or 20550 counting only the distinct ones).

The product of its (nonzero) digits is 292626432, while the sum is 67.

The spelling of 866274940637401 in words is "eight hundred sixty-six trillion, two hundred seventy-four billion, nine hundred forty million, six hundred thirty-seven thousand, four hundred one".