11920206645 has 40 divisors (see below), whose sum is σ = 22057390080. Its totient is φ = 6152358240.

The previous prime is 11920206637. The next prime is 11920206647. The reversal of 11920206645 is 54660202911.

11920206645 is a `hidden beast` number, since 1 + 1 + 9 + 2 + 0 + 2 + 0 + 6 + 645 = 666.

It is not a de Polignac number, because 11920206645 - 2³ = 11920206637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11920206647) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 462165 + ... + 487274.

It is an arithmetic number, because the mean of its divisors is an integer number (551434752).

Almost surely, 2^11920206645 is an apocalyptic number.

11920206645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11920206645 is a deficient number, since it is larger than the sum of its proper divisors (10137183435).

11920206645 is an equidigital number, since it uses as much as digits as its factorization.

11920206645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949487 (or 949478 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 11920206645 in words is "eleven billion, nine hundred twenty million, two hundred six thousand, six hundred forty-five".