1664545513 has 4 divisors (see below), whose sum is σ = 1687989888. Its totient is φ = 1641101140.

The previous prime is 1664545501. The next prime is 1664545517. The reversal of 1664545513 is 3155454661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3155454661 = 2347 ⋅1344463.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664545513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664545517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11722081 + ... + 11722222.

It is an arithmetic number, because the mean of its divisors is an integer number (421997472).

Almost surely, 2^1664545513 is an apocalyptic number.

It is an amenable number.

1664545513 is a deficient number, since it is larger than the sum of its proper divisors (23444375).

1664545513 is an equidigital number, since it uses as much as digits as its factorization.

1664545513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23444374.

The product of its digits is 216000, while the sum is 40.

The square root of 1664545513 is about 40798.8420546466. The cubic root of 1664545513 is about 1185.1279068140.

The spelling of 1664545513 in words is "one billion, six hundred sixty-four million, five hundred forty-five thousand, five hundred thirteen".