645067144741 has 2 divisors, whose sum is σ = 645067144742. Its totient is φ = 645067144740.

The previous prime is 645067144723. The next prime is 645067144769. The reversal of 645067144741 is 147441760546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354280896225 + 290786248516 = 595215^2 + 539246^2 .

It is a cyclic number.

It is not a de Polignac number, because 645067144741 - 2¹⁵ = 645067111973 is a prime.

It is a super-2 number, since 2×645067144741² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645067144721) 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 as a sum of consecutive naturals, namely, 322533572370 + 322533572371.

It is an arithmetic number, because the mean of its divisors is an integer number (322533572371).

Almost surely, 2^645067144741 is an apocalyptic number.

It is an amenable number.

645067144741 is a deficient number, since it is larger than the sum of its proper divisors (1).

645067144741 is an equidigital number, since it uses as much as digits as its factorization.

645067144741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257920, while the sum is 49.

The spelling of 645067144741 in words is "six hundred forty-five billion, sixty-seven million, one hundred forty-four thousand, seven hundred forty-one".