201661052206 has 16 divisors (see below), whose sum is σ = 304411269744. Its totient is φ = 100191285184.

The previous prime is 201661052183. The next prime is 201661052239. The reversal of 201661052206 is 602250166102.

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, 455226 + ... + 781378.

It is an arithmetic number, because the mean of its divisors is an integer number (19025704359).

Almost surely, 2^201661052206 is an apocalyptic number.

201661052206 is a deficient number, since it is larger than the sum of its proper divisors (102750217538).

201661052206 is a wasteful number, since it uses less digits than its factorization.

201661052206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328115.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 201661052206 in words is "two hundred one billion, six hundred sixty-one million, fifty-two thousand, two hundred six".