11278561513 has 4 divisors (see below), whose sum is σ = 11446898320. Its totient is φ = 11110224708.

The previous prime is 11278561487. The next prime is 11278561523. The reversal of 11278561513 is 31516587211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11278561513 - 2³³ = 2688626921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11278561523) 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, 84168303 + ... + 84168436.

It is an arithmetic number, because the mean of its divisors is an integer number (2861724580).

Almost surely, 2^11278561513 is an apocalyptic number.

It is an amenable number.

11278561513 is a deficient number, since it is larger than the sum of its proper divisors (168336807).

11278561513 is an equidigital number, since it uses as much as digits as its factorization.

11278561513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168336806.

The product of its digits is 50400, while the sum is 40.

The spelling of 11278561513 in words is "eleven billion, two hundred seventy-eight million, five hundred sixty-one thousand, five hundred thirteen".