647611653408 has 48 divisors (see below), whose sum is σ = 1705411917216. Its totient is φ = 215180858880.

The previous prime is 647611653401. The next prime is 647611653509. The reversal of 647611653408 is 804356116746.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (647611653401) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10746238 + ... + 10806333.

It is an arithmetic number, because the mean of its divisors is an integer number (35529414942).

Almost surely, 2^647611653408 is an apocalyptic number.

It is an amenable number.

647611653408 is an abundant number, since it is smaller than the sum of its proper divisors (1057800263808).

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

647611653408 is a wasteful number, since it uses less digits than its factorization.

647611653408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21552897 (or 21552889 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 647611653408 in words is "six hundred forty-seven billion, six hundred eleven million, six hundred fifty-three thousand, four hundred eight".