2011554540 has 48 divisors (see below), whose sum is σ = 6258171360. Its totient is φ = 536414400.

The previous prime is 2011554533. The next prime is 2011554553. The reversal of 2011554540 is 454551102.

2011554540 is a `hidden beast` number, since 2 + 0 + 115 + 5 + 4 + 540 = 666.

It is a super-2 number, since 2×2011554540² = 8092703334789223200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 1862011 + ... + 1863090.

It is an arithmetic number, because the mean of its divisors is an integer number (130378570).

Almost surely, 2^2011554540 is an apocalyptic number.

2011554540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011554540 is an abundant number, since it is smaller than the sum of its proper divisors (4246616820).

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

2011554540 is a wasteful number, since it uses less digits than its factorization.

2011554540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725119 (or 3725111 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 2011554540 is about 44850.3571892131. The cubic root of 2011554540 is about 1262.3426937294.

The spelling of 2011554540 in words is "two billion, eleven million, five hundred fifty-four thousand, five hundred forty".