645366917416 has 256 divisors, whose sum is σ = 1519218892800. Its totient is φ = 253427429376.

The previous prime is 645366917389. The next prime is 645366917483. The reversal of 645366917416 is 614719663546.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 453524881 + ... + 453526303.

It is an arithmetic number, because the mean of its divisors is an integer number (5934448800).

Almost surely, 2^645366917416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645366917416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759609446400).

645366917416 is an abundant number, since it is smaller than the sum of its proper divisors (873851975384).

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

645366917416 is a wasteful number, since it uses less digits than its factorization.

645366917416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088 (or 2084 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 58.

The spelling of 645366917416 in words is "six hundred forty-five billion, three hundred sixty-six million, nine hundred seventeen thousand, four hundred sixteen".