1664051047 has 4 divisors (see below), whose sum is σ = 1664484136. Its totient is φ = 1663617960.

The previous prime is 1664051029. The next prime is 1664051057. The reversal of 1664051047 is 7401504661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1664051047 - 2⁷ = 1664050919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664051057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210729 + ... + 218482.

It is an arithmetic number, because the mean of its divisors is an integer number (416121034).

Almost surely, 2^1664051047 is an apocalyptic number.

1664051047 is a deficient number, since it is larger than the sum of its proper divisors (433089).

1664051047 is an equidigital number, since it uses as much as digits as its factorization.

1664051047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433088.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1664051047 is about 40792.7818002156. The cubic root of 1664051047 is about 1185.0105447500.

The spelling of 1664051047 in words is "one billion, six hundred sixty-four million, fifty-one thousand, forty-seven".