201072171605 has 8 divisors (see below), whose sum is σ = 241522935864. Its totient is φ = 160700184000.

The previous prime is 201072171589. The next prime is 201072171623. The reversal of 201072171605 is 506171270102.

It can be written as a sum of positive squares in 4 ways, for example, as 13473173476 + 187598998129 = 116074^2 + 433127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201072171605 - 2⁴ = 201072171589 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 19688546 + ... + 19698755.

It is an arithmetic number, because the mean of its divisors is an integer number (30190366983).

Almost surely, 2^201072171605 is an apocalyptic number.

It is an amenable number.

201072171605 is a deficient number, since it is larger than the sum of its proper divisors (40450764259).

201072171605 is a wasteful number, since it uses less digits than its factorization.

201072171605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39388327.

The product of its (nonzero) digits is 5880, while the sum is 32.

The spelling of 201072171605 in words is "two hundred one billion, seventy-two million, one hundred seventy-one thousand, six hundred five".