647558957 has 2 divisors, whose sum is σ = 647558958. Its totient is φ = 647558956.

The previous prime is 647558921. The next prime is 647558993. The reversal of 647558957 is 759855746.

It is a balanced prime because it is at equal distance from previous prime (647558921) and next prime (647558993).

It can be written as a sum of positive squares in only one way, i.e., 646227241 + 1331716 = 25421^2 + 1154^2 .

It is a cyclic number.

It is not a de Polignac number, because 647558957 - 2¹⁴ = 647542573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647558257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323779478 + 323779479.

It is an arithmetic number, because the mean of its divisors is an integer number (323779479).

Almost surely, 2^647558957 is an apocalyptic number.

It is an amenable number.

647558957 is a deficient number, since it is larger than the sum of its proper divisors (1).

647558957 is an equidigital number, since it uses as much as digits as its factorization.

647558957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584000, while the sum is 56.

The square root of 647558957 is about 25447.1797455042. The cubic root of 647558957 is about 865.1533722940.

The spelling of 647558957 in words is "six hundred forty-seven million, five hundred fifty-eight thousand, nine hundred fifty-seven".