1664345051 has 4 divisors (see below), whose sum is σ = 1664773872. Its totient is φ = 1663916232.

The previous prime is 1664345041. The next prime is 1664345083. The reversal of 1664345051 is 1505434661.

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 1664345051 - 2⁶ = 1664344987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664345041) 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, 208535 + ... + 216368.

It is an arithmetic number, because the mean of its divisors is an integer number (416193468).

Almost surely, 2^1664345051 is an apocalyptic number.

1664345051 is a deficient number, since it is larger than the sum of its proper divisors (428821).

1664345051 is an equidigital number, since it uses as much as digits as its factorization.

1664345051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428820.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1664345051 is about 40796.3852687956. The cubic root of 1664345051 is about 1185.0803297334.

The spelling of 1664345051 in words is "one billion, six hundred sixty-four million, three hundred forty-five thousand, fifty-one".