1664171355 has 64 divisors (see below), whose sum is σ = 3328128000. Its totient is φ = 689848320.

The previous prime is 1664171339. The next prime is 1664171363. The reversal of 1664171355 is 5531714661.

It is not a de Polignac number, because 1664171355 - 2⁴ = 1664171339 is a prime.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 516991 + ... + 520199.

It is an arithmetic number, because the mean of its divisors is an integer number (52002000).

Almost surely, 2^1664171355 is an apocalyptic number.

1664171355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664171355 is a deficient number, since it is larger than the sum of its proper divisors (1663956645).

1664171355 is a wasteful number, since it uses less digits than its factorization.

1664171355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684.

The product of its digits is 75600, while the sum is 39.

The square root of 1664171355 is about 40794.2563971940. The cubic root of 1664171355 is about 1185.0391021297.

The spelling of 1664171355 in words is "one billion, six hundred sixty-four million, one hundred seventy-one thousand, three hundred fifty-five".