127405886640517 has 2 divisors, whose sum is σ = 127405886640518. Its totient is φ = 127405886640516.

The previous prime is 127405886640379. The next prime is 127405886640541. The reversal of 127405886640517 is 715046688504721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109678157434756 + 17727729205761 = 10472734^2 + 4210431^2 .

It is a cyclic number.

It is not a de Polignac number, because 127405886640517 - 2²³ = 127405878251909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127405886640547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63702943320258 + 63702943320259.

It is an arithmetic number, because the mean of its divisors is an integer number (63702943320259).

Almost surely, 2^{127405886640517} is an apocalyptic number.

It is an amenable number.

127405886640517 is a deficient number, since it is larger than the sum of its proper divisors (1).

127405886640517 is an equidigital number, since it uses as much as digits as its factorization.

127405886640517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90316800, while the sum is 64.

The spelling of 127405886640517 in words is "one hundred twenty-seven trillion, four hundred five billion, eight hundred eighty-six million, six hundred forty thousand, five hundred seventeen".