126971571577 has 2 divisors, whose sum is σ = 126971571578. Its totient is φ = 126971571576.

The previous prime is 126971571539. The next prime is 126971571637. The reversal of 126971571577 is 775175179621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120295210896 + 6676360681 = 346836^2 + 81709^2 .

It is a cyclic number.

It is not a de Polignac number, because 126971571577 - 2¹⁵ = 126971538809 is a prime.

It is a super-2 number, since 2×126971571577² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126971541577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63485785788 + 63485785789.

It is an arithmetic number, because the mean of its divisors is an integer number (63485785789).

Almost surely, 2^126971571577 is an apocalyptic number.

It is an amenable number.

126971571577 is a deficient number, since it is larger than the sum of its proper divisors (1).

126971571577 is an equidigital number, since it uses as much as digits as its factorization.

126971571577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6482700, while the sum is 58.

The spelling of 126971571577 in words is "one hundred twenty-six billion, nine hundred seventy-one million, five hundred seventy-one thousand, five hundred seventy-seven".