647646781512 has 32 divisors (see below), whose sum is σ = 1619144222400. Its totient is φ = 215878624704.

The previous prime is 647646781501. The next prime is 647646781541. The reversal of 647646781512 is 215187646746.

It is a super-2 number, since 2×647646781512² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493373 + ... + 1877619.

It is an arithmetic number, because the mean of its divisors is an integer number (50598256950).

Almost surely, 2^647646781512 is an apocalyptic number.

It is an amenable number.

647646781512 is an abundant number, since it is smaller than the sum of its proper divisors (971497440888).

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

647646781512 is a wasteful number, since it uses less digits than its factorization.

647646781512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454485 (or 454481 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 57.

The spelling of 647646781512 in words is "six hundred forty-seven billion, six hundred forty-six million, seven hundred eighty-one thousand, five hundred twelve".