201071501066 has 4 divisors (see below), whose sum is σ = 301607251602. Its totient is φ = 100535750532.

The previous prime is 201071501063. The next prime is 201071501087. The reversal of 201071501066 is 660105170102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 200995305625 + 76195441 = 448325^2 + 8729^2 .

It is not an unprimeable number, because it can be changed into a prime (201071501063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50267875265 + ... + 50267875268.

Almost surely, 2^201071501066 is an apocalyptic number.

201071501066 is a deficient number, since it is larger than the sum of its proper divisors (100535750536).

201071501066 is a wasteful number, since it uses less digits than its factorization.

201071501066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100535750535.

The product of its (nonzero) digits is 2520, while the sum is 29.

Adding to 201071501066 its reverse (660105170102), we get a palindrome (861176671168).

The spelling of 201071501066 in words is "two hundred one billion, seventy-one million, five hundred one thousand, sixty-six".