11813544465 has 16 divisors (see below), whose sum is σ = 18971425536. Its totient is φ = 6277305600.

The previous prime is 11813544451. The next prime is 11813544493. The reversal of 11813544465 is 56444531811.

It is not a de Polignac number, because 11813544465 - 2⁶ = 11813544401 is a prime.

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, 1449016 + ... + 1457145.

It is an arithmetic number, because the mean of its divisors is an integer number (1185714096).

Almost surely, 2^11813544465 is an apocalyptic number.

11813544465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11813544465 is a deficient number, since it is larger than the sum of its proper divisors (7157881071).

11813544465 is a wasteful number, since it uses less digits than its factorization.

11813544465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906440.

The product of its digits is 230400, while the sum is 42.

The spelling of 11813544465 in words is "eleven billion, eight hundred thirteen million, five hundred forty-four thousand, four hundred sixty-five".