166800513623287 has 2 divisors, whose sum is σ = 166800513623288. Its totient is φ = 166800513623286.

The previous prime is 166800513623251. The next prime is 166800513623299. The reversal of 166800513623287 is 782326315008661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166800513623287 - 2²³ = 166800505234679 is a prime.

It is a super-2 number, since 2×166800513623287² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166800513620287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83400256811643 + 83400256811644.

It is an arithmetic number, because the mean of its divisors is an integer number (83400256811644).

Almost surely, 2^{166800513623287} is an apocalyptic number.

166800513623287 is a deficient number, since it is larger than the sum of its proper divisors (1).

166800513623287 is an equidigital number, since it uses as much as digits as its factorization.

166800513623287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 58.

The spelling of 166800513623287 in words is "one hundred sixty-six trillion, eight hundred billion, five hundred thirteen million, six hundred twenty-three thousand, two hundred eighty-seven".