11512553405 has 4 divisors (see below), whose sum is σ = 13815064092. Its totient is φ = 9210042720.

The previous prime is 11512553401. The next prime is 11512553453. The reversal of 11512553405 is 50435521511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2602326169 + 8910227236 = 51013^2 + 94394^2 .

It is not a de Polignac number, because 11512553405 - 2² = 11512553401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11512553401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151255336 + ... + 1151255345.

It is an arithmetic number, because the mean of its divisors is an integer number (3453766023).

Almost surely, 2^11512553405 is an apocalyptic number.

It is an amenable number.

11512553405 is a deficient number, since it is larger than the sum of its proper divisors (2302510687).

11512553405 is an equidigital number, since it uses as much as digits as its factorization.

11512553405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302510686.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 11512553405 in words is "eleven billion, five hundred twelve million, five hundred fifty-three thousand, four hundred five".