201610166521 has 8 divisors (see below), whose sum is σ = 204657250464. Its totient is φ = 198564199680.

The previous prime is 201610166509. The next prime is 201610166539. The reversal of 201610166521 is 125661016102.

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

It is a cyclic number.

It is not a de Polignac number, because 201610166521 - 2⁷ = 201610166393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201610166551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88026 + ... + 641068.

It is an arithmetic number, because the mean of its divisors is an integer number (25582156308).

Almost surely, 2^201610166521 is an apocalyptic number.

It is an amenable number.

201610166521 is a deficient number, since it is larger than the sum of its proper divisors (3047083943).

201610166521 is an equidigital number, since it uses as much as digits as its factorization.

201610166521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558551.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 201610166521 in words is "two hundred one billion, six hundred ten million, one hundred sixty-six thousand, five hundred twenty-one".