2111553540 has 36 divisors (see below), whose sum is σ = 6405046284. Its totient is φ = 563080896.

The previous prime is 2111553517. The next prime is 2111553541. The reversal of 2111553540 is 453551112.

2111553540 is a `hidden beast` number, since 2 + 1 + 115 + 5 + 3 + 540 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1629575424 + 481978116 = 40368^2 + 21954^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (2111553541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5865247 + ... + 5865606.

Almost surely, 2^2111553540 is an apocalyptic number.

2111553540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111553540 is an abundant number, since it is smaller than the sum of its proper divisors (4293492744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2111553540 is a wasteful number, since it uses less digits than its factorization.

2111553540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11730868 (or 11730863 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 2111553540 is about 45951.6434961798. The cubic root of 2111553540 is about 1282.9233193281.

The spelling of 2111553540 in words is "two billion, one hundred eleven million, five hundred fifty-three thousand, five hundred forty".