866761067521373 has 2 divisors, whose sum is σ = 866761067521374. Its totient is φ = 866761067521372.

The previous prime is 866761067521367. The next prime is 866761067521381. The reversal of 866761067521373 is 373125760167668.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866630993328409 + 130074192964 = 29438597^2 + 360658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866761067521373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866761067521273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433380533760686 + 433380533760687.

It is an arithmetic number, because the mean of its divisors is an integer number (433380533760687).

Almost surely, 2^{866761067521373} is an apocalyptic number.

It is an amenable number.

866761067521373 is a deficient number, since it is larger than the sum of its proper divisors (1).

866761067521373 is an equidigital number, since it uses as much as digits as its factorization.

866761067521373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320060160, while the sum is 68.

The spelling of 866761067521373 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, sixty-seven million, five hundred twenty-one thousand, three hundred seventy-three".