645541306496 has 16 divisors (see below), whose sum is σ = 1286039321790. Its totient is φ = 322770653184.

The previous prime is 645541306483. The next prime is 645541306499. The reversal of 645541306496 is 694603145546.

It can be written as a sum of positive squares in only one way, i.e., 360240040000 + 285301266496 = 600200^2 + 534136^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×645541306496² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645541306499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2521645601 + ... + 2521645856.

Almost surely, 2^645541306496 is an apocalyptic number.

It is an amenable number.

645541306496 is a deficient number, since it is larger than the sum of its proper divisors (640498015294).

645541306496 is an equidigital number, since it uses as much as digits as its factorization.

645541306496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5043291471 (or 5043291459 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 53.

The spelling of 645541306496 in words is "six hundred forty-five billion, five hundred forty-one million, three hundred six thousand, four hundred ninety-six".