1275805538128 has 20 divisors (see below), whose sum is σ = 2696588978688. Its totient is φ = 579911608160.

The previous prime is 1275805538087. The next prime is 1275805538131. The reversal of 1275805538128 is 8218355085721.

It is a super-2 number, since 2×1275805538128² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3624447376 + ... + 3624447727.

Almost surely, 2^{1275805538128} is an apocalyptic number.

It is an amenable number.

1275805538128 is an abundant number, since it is smaller than the sum of its proper divisors (1420783440560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1275805538128 is a wasteful number, since it uses less digits than its factorization.

1275805538128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248895122 (or 7248895116 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 55.

The spelling of 1275805538128 in words is "one trillion, two hundred seventy-five billion, eight hundred five million, five hundred thirty-eight thousand, one hundred twenty-eight".