64166887 has 2 divisors, whose sum is σ = 64166888. Its totient is φ = 64166886.

The previous prime is 64166873. The next prime is 64166969. The reversal of 64166887 is 78866146.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64166887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64166867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32083443 + 32083444.

It is an arithmetic number, because the mean of its divisors is an integer number (32083444).

Almost surely, 2^64166887 is an apocalyptic number.

64166887 is a deficient number, since it is larger than the sum of its proper divisors (1).

64166887 is an equidigital number, since it uses as much as digits as its factorization.

64166887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 64166887 is about 8010.4236467243. The cubic root of 64166887 is about 400.3473794814.

It can be divided in two parts, 641 and 66887, that added together give a triangular number (67528 = T₃₆₇).

The spelling of 64166887 in words is "sixty-four million, one hundred sixty-six thousand, eight hundred eighty-seven".