645746356 has 6 divisors (see below), whose sum is σ = 1130056130. Its totient is φ = 322873176.

The previous prime is 645746341. The next prime is 645746357. The reversal of 645746356 is 653647546.

It can be written as a sum of positive squares in only one way, i.e., 550371600 + 95374756 = 23460^2 + 9766^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645746357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80718291 + ... + 80718298.

Almost surely, 2^645746356 is an apocalyptic number.

It is an amenable number.

645746356 is a deficient number, since it is larger than the sum of its proper divisors (484309774).

645746356 is a wasteful number, since it uses less digits than its factorization.

645746356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161436593 (or 161436591 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 46.

The square root of 645746356 is about 25411.5398195387. The cubic root of 645746356 is about 864.3453926716.

The spelling of 645746356 in words is "six hundred forty-five million, seven hundred forty-six thousand, three hundred fifty-six".