645947323997580 has 144 divisors (see below), whose sum is σ = 2249998334438400. Its totient is φ = 148351538517120.

The previous prime is 645947323997537. The next prime is 645947323997617. The reversal of 645947323997580 is 85799323749546.

645947323997580 is a `hidden beast` number, since 6 + 4 + 5 + 9 + 4 + 7 + 3 + 23 + 9 + 9 + 7 + 580 = 666.

645947323997580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645947323997580.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8585120860 + ... + 8585196099.

It is an arithmetic number, because the mean of its divisors is an integer number (15624988433600).

Almost surely, 2^{645947323997580} is an apocalyptic number.

645947323997580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645947323997580 is an abundant number, since it is smaller than the sum of its proper divisors (1604051010440820).

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

645947323997580 is a wasteful number, since it uses less digits than its factorization.

645947323997580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17170317004 (or 17170316999 counting only the distinct ones).

The product of its (nonzero) digits is 12345177600, while the sum is 81.

The spelling of 645947323997580 in words is "six hundred forty-five trillion, nine hundred forty-seven billion, three hundred twenty-three million, nine hundred ninety-seven thousand, five hundred eighty".