2001866851870 has 32 divisors (see below), whose sum is σ = 3725256822336. Its totient is φ = 773945280000.

The previous prime is 2001866851849. The next prime is 2001866851951. The reversal of 2001866851870 is 781586681002.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 17859531 + ... + 17971270.

It is an arithmetic number, because the mean of its divisors is an integer number (116414275698).

Almost surely, 2^{2001866851870} is an apocalyptic number.

2001866851870 is a deficient number, since it is larger than the sum of its proper divisors (1723389970466).

2001866851870 is a wasteful number, since it uses less digits than its factorization.

2001866851870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35830996.

The product of its (nonzero) digits is 1290240, while the sum is 52.

The spelling of 2001866851870 in words is "two trillion, one billion, eight hundred sixty-six million, eight hundred fifty-one thousand, eight hundred seventy".