645606555360 has 192 divisors, whose sum is σ = 2214705810240. Its totient is φ = 157132800000.

The previous prime is 645606555337. The next prime is 645606555457. The reversal of 645606555360 is 63555606546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25891 + ... + 1136610.

It is an arithmetic number, because the mean of its divisors is an integer number (11534926095).

Almost surely, 2^645606555360 is an apocalyptic number.

645606555360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645606555360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107352905120).

645606555360 is an abundant number, since it is smaller than the sum of its proper divisors (1569099254880).

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

645606555360 is a wasteful number, since it uses less digits than its factorization.

645606555360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162621 (or 1162613 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 51.

The spelling of 645606555360 in words is "six hundred forty-five billion, six hundred six million, five hundred fifty-five thousand, three hundred sixty".