1261000113265 has 8 divisors (see below), whose sum is σ = 1513214696448. Its totient is φ = 1008790383600.

The previous prime is 1261000113259. The next prime is 1261000113299. The reversal of 1261000113265 is 5623110001621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261000113265 - 2³³ = 1252410178673 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614961 + ... + 1702990.

It is an arithmetic number, because the mean of its divisors is an integer number (189151837056).

Almost surely, 2^{1261000113265} is an apocalyptic number.

It is an amenable number.

1261000113265 is a deficient number, since it is larger than the sum of its proper divisors (252214583183).

1261000113265 is a wasteful number, since it uses less digits than its factorization.

1261000113265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426759.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 1261000113265 its reverse (5623110001621), we get a palindrome (6884110114886).

The spelling of 1261000113265 in words is "one trillion, two hundred sixty-one billion, one hundred thirteen thousand, two hundred sixty-five".