1306111026561 has 16 divisors (see below), whose sum is σ = 1902146224320. Its totient is φ = 790603953920.

The previous prime is 1306111026487. The next prime is 1306111026581. The reversal of 1306111026561 is 1656201116031.

It is not a de Polignac number, because 1306111026561 - 2⁷ = 1306111026433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1306111026581) 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, 24435060 + ... + 24488453.

It is an arithmetic number, because the mean of its divisors is an integer number (118884139020).

Almost surely, 2^{1306111026561} is an apocalyptic number.

1306111026561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1306111026561 is a deficient number, since it is larger than the sum of its proper divisors (596035197759).

1306111026561 is a wasteful number, since it uses less digits than its factorization.

1306111026561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48924336.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 1306111026561 in words is "one trillion, three hundred six billion, one hundred eleven million, twenty-six thousand, five hundred sixty-one".