1269123540855 has 32 divisors (see below), whose sum is σ = 2118957235200. Its totient is φ = 647414718720.

The previous prime is 1269123540803. The next prime is 1269123540857. The reversal of 1269123540855 is 5580453219621.

It is a happy number.

It is not a de Polignac number, because 1269123540855 - 2¹⁵ = 1269123508087 is a prime.

It is a super-2 number, since 2×1269123540855² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1269123540798 and 1269123540807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1269123540857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15705846 + ... + 15786444.

It is an arithmetic number, because the mean of its divisors is an integer number (66217413600).

Almost surely, 2^{1269123540855} is an apocalyptic number.

1269123540855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1269123540855 is a deficient number, since it is larger than the sum of its proper divisors (849833694345).

1269123540855 is a wasteful number, since it uses less digits than its factorization.

1269123540855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126271.

The product of its (nonzero) digits is 2592000, while the sum is 51.

The spelling of 1269123540855 in words is "one trillion, two hundred sixty-nine billion, one hundred twenty-three million, five hundred forty thousand, eight hundred fifty-five".