645110681512 has 16 divisors (see below), whose sum is σ = 1319544576000. Its totient is φ = 293232127920.

The previous prime is 645110681491. The next prime is 645110681513. The reversal of 645110681512 is 215186011546.

It is a super-3 number, since 3×645110681512³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (645110681513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3665401512 + ... + 3665401687.

It is an arithmetic number, because the mean of its divisors is an integer number (82471536000).

Almost surely, 2^645110681512 is an apocalyptic number.

It is an amenable number.

645110681512 is an abundant number, since it is smaller than the sum of its proper divisors (674433894488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645110681512 is a wasteful number, since it uses less digits than its factorization.

645110681512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7330803216 (or 7330803212 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 645110681512 in words is "six hundred forty-five billion, one hundred ten million, six hundred eighty-one thousand, five hundred twelve".