665127873437 has 2 divisors, whose sum is σ = 665127873438. Its totient is φ = 665127873436.

The previous prime is 665127873367. The next prime is 665127873517. The reversal of 665127873437 is 734378721566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585907578916 + 79220294521 = 765446^2 + 281461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665127873437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665127573437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332563936718 + 332563936719.

It is an arithmetic number, because the mean of its divisors is an integer number (332563936719).

Almost surely, 2^665127873437 is an apocalyptic number.

It is an amenable number.

665127873437 is a deficient number, since it is larger than the sum of its proper divisors (1).

665127873437 is an equidigital number, since it uses as much as digits as its factorization.

665127873437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35562240, while the sum is 59.

The spelling of 665127873437 in words is "six hundred sixty-five billion, one hundred twenty-seven million, eight hundred seventy-three thousand, four hundred thirty-seven".