647775144560 has 80 divisors (see below), whose sum is σ = 1571743669824. Its totient is φ = 247815254016.

The previous prime is 647775144557. The next prime is 647775144589. The reversal of 647775144560 is 65441577746.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×647775144560² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 647775144496 and 647775144505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21978794 + ... + 22008246.

Almost surely, 2^647775144560 is an apocalyptic number.

It is an amenable number.

647775144560 is an abundant number, since it is smaller than the sum of its proper divisors (923968525264).

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

647775144560 is a wasteful number, since it uses less digits than its factorization.

647775144560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41442 (or 41436 counting only the distinct ones).

The product of its (nonzero) digits is 19756800, while the sum is 56.

The spelling of 647775144560 in words is "six hundred forty-seven billion, seven hundred seventy-five million, one hundred forty-four thousand, five hundred sixty".