1664157858 has 32 divisors (see below), whose sum is σ = 3708149760. Its totient is φ = 493559760.

The previous prime is 1664157857. The next prime is 1664157889. The reversal of 1664157858 is 8587514661.

It is a self number, because there is not a number n which added to its sum of digits gives 1664157858.

It is not an unprimeable number, because it can be changed into a prime (1664157851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265138 + ... + 271341.

It is an arithmetic number, because the mean of its divisors is an integer number (115879680).

Almost surely, 2^1664157858 is an apocalyptic number.

1664157858 is an abundant number, since it is smaller than the sum of its proper divisors (2043991902).

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

1664157858 is a wasteful number, since it uses less digits than its factorization.

1664157858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536542.

The product of its digits is 1612800, while the sum is 51.

The square root of 1664157858 is about 40794.0909691588. The cubic root of 1664157858 is about 1185.0358984300.

The spelling of 1664157858 in words is "one billion, six hundred sixty-four million, one hundred fifty-seven thousand, eight hundred fifty-eight".