201871887172 has 24 divisors (see below), whose sum is σ = 357220848600. Its totient is φ = 99810554880.

The previous prime is 201871887169. The next prime is 201871887197. The reversal of 201871887172 is 271788178102.

It can be written as a sum of positive squares in 4 ways, for example, as 21335276356 + 180536610816 = 146066^2 + 424896^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237954 + ... + 678502.

It is an arithmetic number, because the mean of its divisors is an integer number (14884202025).

Almost surely, 2^201871887172 is an apocalyptic number.

It is an amenable number.

201871887172 is a deficient number, since it is larger than the sum of its proper divisors (155348961428).

201871887172 is a wasteful number, since it uses less digits than its factorization.

201871887172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441831 (or 441829 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 52.

The spelling of 201871887172 in words is "two hundred one billion, eight hundred seventy-one million, eight hundred eighty-seven thousand, one hundred seventy-two".