866149693 has 2 divisors, whose sum is σ = 866149694. Its totient is φ = 866149692.

The previous prime is 866149679. The next prime is 866149721. The reversal of 866149693 is 396941668.

866149693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 808662969 + 57486724 = 28437^2 + 7582^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866149693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866149693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866149673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433074846 + 433074847.

It is an arithmetic number, because the mean of its divisors is an integer number (433074847).

Almost surely, 2^866149693 is an apocalyptic number.

It is an amenable number.

866149693 is a deficient number, since it is larger than the sum of its proper divisors (1).

866149693 is an equidigital number, since it uses as much as digits as its factorization.

866149693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 52.

The square root of 866149693 is about 29430.4212168294. The cubic root of 866149693 is about 953.2298901432.

The spelling of 866149693 in words is "eight hundred sixty-six million, one hundred forty-nine thousand, six hundred ninety-three".