1265842490128 has 10 divisors (see below), whose sum is σ = 2452569824654. Its totient is φ = 632921245056.

The previous prime is 1265842490123. The next prime is 1265842490149. The reversal of 1265842490128 is 8210942485621.

It can be written as a sum of positive squares in only one way, i.e., 1265472004624 + 370485504 = 1124932^2 + 19248^2 .

It is not an unprimeable number, because it can be changed into a prime (1265842490123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39557577801 + ... + 39557577832.

Almost surely, 2^{1265842490128} is an apocalyptic number.

It is an amenable number.

1265842490128 is a deficient number, since it is larger than the sum of its proper divisors (1186727334526).

1265842490128 is an equidigital number, since it uses as much as digits as its factorization.

1265842490128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79115155641 (or 79115155635 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 52.

The spelling of 1265842490128 in words is "one trillion, two hundred sixty-five billion, eight hundred forty-two million, four hundred ninety thousand, one hundred twenty-eight".