1645264463 has 4 divisors (see below), whose sum is σ = 1645368480. Its totient is φ = 1645160448.

The previous prime is 1645264417. The next prime is 1645264483. The reversal of 1645264463 is 3644625461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3644625461 = 17 ⋅214389733.

It is a cyclic number.

It is not a de Polignac number, because 1645264463 - 2¹⁶ = 1645198927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645264463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645264483) 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, 22823 + ... + 61736.

It is an arithmetic number, because the mean of its divisors is an integer number (411342120).

Almost surely, 2^1645264463 is an apocalyptic number.

1645264463 is a deficient number, since it is larger than the sum of its proper divisors (104017).

1645264463 is an equidigital number, since it uses as much as digits as its factorization.

1645264463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104016.

The product of its digits is 414720, while the sum is 41.

The square root of 1645264463 is about 40561.8597083516. The cubic root of 1645264463 is about 1180.5341981820.

The spelling of 1645264463 in words is "one billion, six hundred forty-five million, two hundred sixty-four thousand, four hundred sixty-three".