1265401401055 has 16 divisors (see below), whose sum is σ = 1691770696704. Its totient is φ = 900711246880.

The previous prime is 1265401401053. The next prime is 1265401401067. The reversal of 1265401401055 is 5501041045621.

It is not a de Polignac number, because 1265401401055 - 2¹ = 1265401401053 is a prime.

It is a super-2 number, since 2×1265401401055² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1265401401055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265401401053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244755907 + ... + 244761076.

It is an arithmetic number, because the mean of its divisors is an integer number (105735668544).

Almost surely, 2^{1265401401055} is an apocalyptic number.

1265401401055 is a deficient number, since it is larger than the sum of its proper divisors (426369295649).

1265401401055 is a wasteful number, since it uses less digits than its factorization.

1265401401055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489517046.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 1265401401055 its reverse (5501041045621), we get a palindrome (6766442446676).

The spelling of 1265401401055 in words is "one trillion, two hundred sixty-five billion, four hundred one million, four hundred one thousand, fifty-five".