645075447776 has 24 divisors (see below), whose sum is σ = 1270054140264. Its totient is φ = 322522015360.

The previous prime is 645075447749. The next prime is 645075447827. The reversal of 645075447776 is 677744570546.

It is a super-2 number, since 2×645075447776² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190991 + ... + 1151793.

It is an arithmetic number, because the mean of its divisors is an integer number (52918922511).

Almost surely, 2^645075447776 is an apocalyptic number.

It is an amenable number.

645075447776 is a deficient number, since it is larger than the sum of its proper divisors (624978692488).

645075447776 is a wasteful number, since it uses less digits than its factorization.

645075447776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981794 (or 981786 counting only the distinct ones).

The product of its (nonzero) digits is 138297600, while the sum is 62.

The spelling of 645075447776 in words is "six hundred forty-five billion, seventy-five million, four hundred forty-seven thousand, seven hundred seventy-six".