201771728231488 has 28 divisors (see below), whose sum is σ = 400411082594572. Its totient is φ = 100880746790400.

The previous prime is 201771728231477. The next prime is 201771728231509. The reversal of 201771728231488 is 884132827177102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 125683651000384 + 76088077231104 = 11210872^2 + 8722848^2 .

It is a super-2 number, since 2×201771728231488² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78686463 + ... + 81210238.

It is an arithmetic number, because the mean of its divisors is an integer number (14300395806949).

Almost surely, 2^{201771728231488} is an apocalyptic number.

It is an amenable number.

201771728231488 is a deficient number, since it is larger than the sum of its proper divisors (198639354363084).

201771728231488 is a wasteful number, since it uses less digits than its factorization.

201771728231488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159916430 (or 159916420 counting only the distinct ones).

The product of its (nonzero) digits is 16859136, while the sum is 61.

The spelling of 201771728231488 in words is "two hundred one trillion, seven hundred seventy-one billion, seven hundred twenty-eight million, two hundred thirty-one thousand, four hundred eighty-eight".