664155859 has 2 divisors, whose sum is σ = 664155860. Its totient is φ = 664155858.

The previous prime is 664155853. The next prime is 664155917. The reversal of 664155859 is 958551466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664155859 - 2¹³ = 664147667 is a prime.

It is a super-2 number, since 2×664155859² = 882206010088055762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (664155853) 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, 332077929 + 332077930.

It is an arithmetic number, because the mean of its divisors is an integer number (332077930).

Almost surely, 2^664155859 is an apocalyptic number.

664155859 is a deficient number, since it is larger than the sum of its proper divisors (1).

664155859 is an equidigital number, since it uses as much as digits as its factorization.

664155859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296000, while the sum is 49.

The square root of 664155859 is about 25771.2215271221. The cubic root of 664155859 is about 872.4823887875.

It can be divided in two parts, 6641 and 55859, that added together give a square (62500 = 250²).

The spelling of 664155859 in words is "six hundred sixty-four million, one hundred fifty-five thousand, eight hundred fifty-nine".