645040031651 has 2 divisors, whose sum is σ = 645040031652. Its totient is φ = 645040031650.

The previous prime is 645040031591. The next prime is 645040031711. The reversal of 645040031651 is 156130040546.

It is a balanced prime because it is at equal distance from previous prime (645040031591) and next prime (645040031711).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645040031651 is a prime.

It is not a weakly prime, because it can be changed into another prime (645040021651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322520015825 + 322520015826.

It is an arithmetic number, because the mean of its divisors is an integer number (322520015826).

Almost surely, 2^645040031651 is an apocalyptic number.

645040031651 is a deficient number, since it is larger than the sum of its proper divisors (1).

645040031651 is an equidigital number, since it uses as much as digits as its factorization.

645040031651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 645040031651 in words is "six hundred forty-five billion, forty million, thirty-one thousand, six hundred fifty-one".