645215001611 has 16 divisors (see below), whose sum is σ = 696624537600. Its totient is φ = 595760450208.

The previous prime is 645215001593. The next prime is 645215001647. The reversal of 645215001611 is 116100512546.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645215001611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645215091611) 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, 3297950 + ... + 3488108.

It is an arithmetic number, because the mean of its divisors is an integer number (43539033600).

Almost surely, 2^645215001611 is an apocalyptic number.

645215001611 is a deficient number, since it is larger than the sum of its proper divisors (51409535989).

645215001611 is a wasteful number, since it uses less digits than its factorization.

645215001611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195298.

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 645215001611 in words is "six hundred forty-five billion, two hundred fifteen million, one thousand, six hundred eleven".