4647391719961 has 3 divisors (see below), whose sum is σ = 4647393875743. Its totient is φ = 4647389564180.

The previous prime is 4647391719947. The next prime is 4647391719979. The reversal of 4647391719961 is 1699171937464.

The square root of 4647391719961 is 2155781.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2937730868361 + 1709660851600 = 1713981^2 + 1307540^2 .

It is not a de Polignac number, because 4647391719961 - 2¹⁹ = 4647391195673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4647391719931) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1077891 + ... + 3233671.

Almost surely, 2^{4647391719961} is an apocalyptic number.

4647391719961 is the 2155781-st square number.

4647391719961 is the 1077891-st centered octagonal number.

It is an amenable number.

4647391719961 is a deficient number, since it is larger than the sum of its proper divisors (2155782).

4647391719961 is an frugal number, since it uses more digits than its factorization.

4647391719961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4311562 (or 2155781 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 67.

The spelling of 4647391719961 in words is "four trillion, six hundred forty-seven billion, three hundred ninety-one million, seven hundred nineteen thousand, nine hundred sixty-one".