127665437477 has 2 divisors, whose sum is σ = 127665437478. Its totient is φ = 127665437476.

The previous prime is 127665437453. The next prime is 127665437503. The reversal of 127665437477 is 774734566721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106694342881 + 20971094596 = 326641^2 + 144814^2 .

It is a cyclic number.

It is not a de Polignac number, because 127665437477 - 2¹⁸ = 127665175333 is a prime.

It is a super-2 number, since 2×127665437477² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127665437777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63832718738 + 63832718739.

It is an arithmetic number, because the mean of its divisors is an integer number (63832718739).

Almost surely, 2^127665437477 is an apocalyptic number.

It is an amenable number.

127665437477 is a deficient number, since it is larger than the sum of its proper divisors (1).

127665437477 is an equidigital number, since it uses as much as digits as its factorization.

127665437477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41489280, while the sum is 59.

It can be divided in two parts, 1276654 and 37477, that added together give a palindrome (1314131).

The spelling of 127665437477 in words is "one hundred twenty-seven billion, six hundred sixty-five million, four hundred thirty-seven thousand, four hundred seventy-seven".