665147226437 has 2 divisors, whose sum is σ = 665147226438. Its totient is φ = 665147226436.

The previous prime is 665147226431. The next prime is 665147226451. The reversal of 665147226437 is 734622741566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541039686916 + 124107539521 = 735554^2 + 352289^2 .

It is a cyclic number.

It is not a de Polignac number, because 665147226437 - 2⁸ = 665147226181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665147226431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332573613218 + 332573613219.

It is an arithmetic number, because the mean of its divisors is an integer number (332573613219).

Almost surely, 2^665147226437 is an apocalyptic number.

It is an amenable number.

665147226437 is a deficient number, since it is larger than the sum of its proper divisors (1).

665147226437 is an equidigital number, since it uses as much as digits as its factorization.

665147226437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 53.

The spelling of 665147226437 in words is "six hundred sixty-five billion, one hundred forty-seven million, two hundred twenty-six thousand, four hundred thirty-seven".