125121642277 has 2 divisors, whose sum is σ = 125121642278. Its totient is φ = 125121642276.

The previous prime is 125121642271. The next prime is 125121642329. The reversal of 125121642277 is 772246121521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124040613636 + 1081028641 = 352194^2 + 32879^2 .

It is a cyclic number.

It is not a de Polignac number, because 125121642277 - 2¹¹ = 125121640229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125121642271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62560821138 + 62560821139.

It is an arithmetic number, because the mean of its divisors is an integer number (62560821139).

Almost surely, 2^125121642277 is an apocalyptic number.

It is an amenable number.

125121642277 is a deficient number, since it is larger than the sum of its proper divisors (1).

125121642277 is an equidigital number, since it uses as much as digits as its factorization.

125121642277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 40.

Adding to 125121642277 its reverse (772246121521), we get a palindrome (897367763798).

The spelling of 125121642277 in words is "one hundred twenty-five billion, one hundred twenty-one million, six hundred forty-two thousand, two hundred seventy-seven".