645246200561 has 8 divisors (see below), whose sum is σ = 653209146720. Its totient is φ = 637319043648.

The previous prime is 645246200551. The next prime is 645246200591. The reversal of 645246200561 is 165002642546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645246200561 - 2¹⁰ = 645246199537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645246200551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8911031 + ... + 8983148.

It is an arithmetic number, because the mean of its divisors is an integer number (81651143340).

Almost surely, 2^645246200561 is an apocalyptic number.

It is an amenable number.

645246200561 is a deficient number, since it is larger than the sum of its proper divisors (7962946159).

645246200561 is a wasteful number, since it uses less digits than its factorization.

645246200561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17894623.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 645246200561 in words is "six hundred forty-five billion, two hundred forty-six million, two hundred thousand, five hundred sixty-one".