647705739961 has 16 divisors (see below), whose sum is σ = 760411440000. Its totient is φ = 551450289264.

The previous prime is 647705739929. The next prime is 647705739971. The reversal of 647705739961 is 169937507746.

It is not a de Polignac number, because 647705739961 - 2⁵ = 647705739929 is a prime.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647705739893 and 647705739902.

It is not an unprimeable number, because it can be changed into a prime (647705739971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6285655 + ... + 6387868.

It is an arithmetic number, because the mean of its divisors is an integer number (47525715000).

Almost surely, 2^647705739961 is an apocalyptic number.

It is an amenable number.

647705739961 is a deficient number, since it is larger than the sum of its proper divisors (112705700039).

647705739961 is a wasteful number, since it uses less digits than its factorization.

647705739961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12673693 (or 12673679 counting only the distinct ones).

The product of its (nonzero) digits is 60011280, while the sum is 64.

The spelling of 647705739961 in words is "six hundred forty-seven billion, seven hundred five million, seven hundred thirty-nine thousand, nine hundred sixty-one".