645065533 has 4 divisors (see below), whose sum is σ = 737217760. Its totient is φ = 552913308.

The previous prime is 645065483. The next prime is 645065537. The reversal of 645065533 is 335560546.

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: 335560546 = 2 ⋅167780273.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645065533 is a prime.

It is a super-2 number, since 2×645065533² = 832219083729148178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645065492 and 645065501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645065537) 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, 46076103 + ... + 46076116.

It is an arithmetic number, because the mean of its divisors is an integer number (184304440).

Almost surely, 2^645065533 is an apocalyptic number.

It is an amenable number.

645065533 is a deficient number, since it is larger than the sum of its proper divisors (92152227).

645065533 is an equidigital number, since it uses as much as digits as its factorization.

645065533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92152226.

The product of its (nonzero) digits is 162000, while the sum is 37.

The square root of 645065533 is about 25398.1403453087. The cubic root of 645065533 is about 864.0415204419.

The spelling of 645065533 in words is "six hundred forty-five million, sixty-five thousand, five hundred thirty-three".