647124179969 has 2 divisors, whose sum is σ = 647124179970. Its totient is φ = 647124179968.

The previous prime is 647124179963. The next prime is 647124179993. The reversal of 647124179969 is 969971421746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371197747600 + 275926432369 = 609260^2 + 525287^2 .

It is a cyclic number.

It is not a de Polignac number, because 647124179969 - 2²⁰ = 647123131393 is a prime.

It is a super-2 number, since 2×647124179969² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (647124179963) 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 as a sum of consecutive naturals, namely, 323562089984 + 323562089985.

It is an arithmetic number, because the mean of its divisors is an integer number (323562089985).

Almost surely, 2^647124179969 is an apocalyptic number.

It is an amenable number.

647124179969 is a deficient number, since it is larger than the sum of its proper divisors (1).

647124179969 is an equidigital number, since it uses as much as digits as its factorization.

647124179969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41150592, while the sum is 65.

The spelling of 647124179969 in words is "six hundred forty-seven billion, one hundred twenty-four million, one hundred seventy-nine thousand, nine hundred sixty-nine".