645612033 has 16 divisors (see below), whose sum is σ = 939499776. Its totient is φ = 391101840.

The previous prime is 645612031. The next prime is 645612059. The reversal of 645612033 is 330216546.

It is not a de Polignac number, because 645612033 - 2¹ = 645612031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645612031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126966 + ... + 131952.

It is an arithmetic number, because the mean of its divisors is an integer number (58718736).

Almost surely, 2^645612033 is an apocalyptic number.

It is an amenable number.

645612033 is a deficient number, since it is larger than the sum of its proper divisors (293887743).

645612033 is a wasteful number, since it uses less digits than its factorization.

645612033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8924.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 645612033 is about 25408.8967292954. The cubic root of 645612033 is about 864.2854571070.

Adding to 645612033 its reverse (330216546), we get a palindrome (975828579).

The spelling of 645612033 in words is "six hundred forty-five million, six hundred twelve thousand, thirty-three".