645303140005521 has 8 divisors (see below), whose sum is σ = 860408272637920. Its totient is φ = 430200050355072.

The previous prime is 645303140005493. The next prime is 645303140005543. The reversal of 645303140005521 is 125500041303546.

It is a happy number.

645303140005521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645303140005521 - 2¹⁸ = 645303139743377 is a prime.

It is a super-2 number, since 2×645303140005521² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645303140005521.

It is not an unprimeable number, because it can be changed into a prime (645303140025521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510008320 + ... + 511272033.

It is an arithmetic number, because the mean of its divisors is an integer number (107551034079740).

Almost surely, 2^{645303140005521} is an apocalyptic number.

It is an amenable number.

645303140005521 is a deficient number, since it is larger than the sum of its proper divisors (215105132632399).

645303140005521 is a wasteful number, since it uses less digits than its factorization.

645303140005521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021490975.

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 645303140005521 in words is "six hundred forty-five trillion, three hundred three billion, one hundred forty million, five thousand, five hundred twenty-one".