647455742344 has 8 divisors (see below), whose sum is σ = 1213979516910. Its totient is φ = 323727871168.

The previous prime is 647455742321. The next prime is 647455742443. The reversal of 647455742344 is 443247554746.

It can be written as a sum of positive squares in only one way, i.e., 643380452100 + 4075290244 = 802110^2 + 63838^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×647455742344² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40465983889 + ... + 40465983904.

Almost surely, 2^647455742344 is an apocalyptic number.

It is an amenable number.

647455742344 is a deficient number, since it is larger than the sum of its proper divisors (566523774566).

647455742344 is a wasteful number, since it uses less digits than its factorization.

647455742344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80931967799 (or 80931967795 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 55.

The spelling of 647455742344 in words is "six hundred forty-seven billion, four hundred fifty-five million, seven hundred forty-two thousand, three hundred forty-four".