866757166111421 has 16 divisors (see below), whose sum is σ = 988783485682608. Its totient is φ = 752680754611200.

The previous prime is 866757166111351. The next prime is 866757166111433. The reversal of 866757166111421 is 124111661757668.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8365318305796 + 858391847805625 = 2892286^2 + 29298325^2 .

It is a cyclic number.

It is not a de Polignac number, because 866757166111421 - 2⁴⁶ = 796388421933757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866757166111451) 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, 882439850 + ... + 883421531.

It is an arithmetic number, because the mean of its divisors is an integer number (61798967855163).

Almost surely, 2^{866757166111421} is an apocalyptic number.

It is an amenable number.

866757166111421 is a deficient number, since it is larger than the sum of its proper divisors (122026319571187).

866757166111421 is a wasteful number, since it uses less digits than its factorization.

866757166111421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765863632.

The product of its digits is 20321280, while the sum is 62.

The spelling of 866757166111421 in words is "eight hundred sixty-six trillion, seven hundred fifty-seven billion, one hundred sixty-six million, one hundred eleven thousand, four hundred twenty-one".