647120488961 has 4 divisors (see below), whose sum is σ = 647646177024. Its totient is φ = 646594800900.

The previous prime is 647120488939. The next prime is 647120488981. The reversal of 647120488961 is 169884021746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 169884021746 = 2 ⋅84942010873.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647120488961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647120488897 and 647120488906.

It is not an unprimeable number, because it can be changed into a prime (647120488981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262842185 + ... + 262844646.

It is an arithmetic number, because the mean of its divisors is an integer number (161911544256).

Almost surely, 2^647120488961 is an apocalyptic number.

It is an amenable number.

647120488961 is a deficient number, since it is larger than the sum of its proper divisors (525688063).

647120488961 is a wasteful number, since it uses less digits than its factorization.

647120488961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525688062.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 647120488961 in words is "six hundred forty-seven billion, one hundred twenty million, four hundred eighty-eight thousand, nine hundred sixty-one".