1664388858 has 16 divisors (see below), whose sum is σ = 3631394016. Its totient is φ = 504360240.

The previous prime is 1664388857. The next prime is 1664388877. The reversal of 1664388858 is 8588834661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1664388798 and 1664388807.

It is not an unprimeable number, because it can be changed into a prime (1664388857) 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 in 7 ways as a sum of consecutive naturals, for example, 12608941 + ... + 12609072.

It is an arithmetic number, because the mean of its divisors is an integer number (226962126).

Almost surely, 2^1664388858 is an apocalyptic number.

1664388858 is an abundant number, since it is smaller than the sum of its proper divisors (1967005158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664388858 is a wasteful number, since it uses less digits than its factorization.

1664388858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25218029.

The product of its digits is 8847360, while the sum is 57.

The square root of 1664388858 is about 40796.9221633201. The cubic root of 1664388858 is about 1185.0907270883.

It can be divided in two parts, 16643 and 88858, that added together give a palindrome (105501).

The spelling of 1664388858 in words is "one billion, six hundred sixty-four million, three hundred eighty-eight thousand, eight hundred fifty-eight".