127774621477 has 2 divisors, whose sum is σ = 127774621478. Its totient is φ = 127774621476.

The previous prime is 127774621453. The next prime is 127774621489. The reversal of 127774621477 is 774126477721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96555618756 + 31219002721 = 310734^2 + 176689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127774621477 is a prime.

It is a super-4 number, since 4×127774621477⁴ (a number of 46 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127774621427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63887310738 + 63887310739.

It is an arithmetic number, because the mean of its divisors is an integer number (63887310739).

Almost surely, 2^127774621477 is an apocalyptic number.

It is an amenable number.

127774621477 is a deficient number, since it is larger than the sum of its proper divisors (1).

127774621477 is an equidigital number, since it uses as much as digits as its factorization.

127774621477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6453888, while the sum is 55.

The spelling of 127774621477 in words is "one hundred twenty-seven billion, seven hundred seventy-four million, six hundred twenty-one thousand, four hundred seventy-seven".