645010566 has 64 divisors (see below), whose sum is σ = 1410167232. Its totient is φ = 195858432.

The previous prime is 645010507. The next prime is 645010567. The reversal of 645010566 is 665010546.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645010567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1045090 + ... + 1045706.

It is an arithmetic number, because the mean of its divisors is an integer number (22033863).

Almost surely, 2^645010566 is an apocalyptic number.

645010566 is an abundant number, since it is smaller than the sum of its proper divisors (765156666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645010566 is a wasteful number, since it uses less digits than its factorization.

645010566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 645010566 is about 25397.0582154705. The cubic root of 645010566 is about 864.0169776542.

The spelling of 645010566 in words is "six hundred forty-five million, ten thousand, five hundred sixty-six".