1261052540005 has 16 divisors (see below), whose sum is σ = 1574093430000. Its totient is φ = 968672839680.

The previous prime is 1261052539987. The next prime is 1261052540087. The reversal of 1261052540005 is 5000452501621.

It can be written as a sum of positive squares in 8 ways, for example, as 53062504609 + 1207990035396 = 230353^2 + 1099086^2 .

It is not a de Polignac number, because 1261052540005 - 2³³ = 1252462605413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23998380 + ... + 24050869.

It is an arithmetic number, because the mean of its divisors is an integer number (98380839375).

Almost surely, 2^{1261052540005} is an apocalyptic number.

It is an amenable number.

1261052540005 is a deficient number, since it is larger than the sum of its proper divisors (313040889995).

1261052540005 is a wasteful number, since it uses less digits than its factorization.

1261052540005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48049464.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 1261052540005 in words is "one trillion, two hundred sixty-one billion, fifty-two million, five hundred forty thousand, five".