2001855011887 has 2 divisors, whose sum is σ = 2001855011888. Its totient is φ = 2001855011886.

The previous prime is 2001855011851. The next prime is 2001855011921. The reversal of 2001855011887 is 7881105581002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001855011887 - 2¹⁹ = 2001854487599 is a prime.

It is a super-2 number, since 2×2001855011887² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001855018887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000927505943 + 1000927505944.

It is an arithmetic number, because the mean of its divisors is an integer number (1000927505944).

Almost surely, 2^{2001855011887} is an apocalyptic number.

2001855011887 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001855011887 is an equidigital number, since it uses as much as digits as its factorization.

2001855011887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 179200, while the sum is 46.

The spelling of 2001855011887 in words is "two trillion, one billion, eight hundred fifty-five million, eleven thousand, eight hundred eighty-seven".