165106631612621 has 8 divisors (see below), whose sum is σ = 165366526234560. Its totient is φ = 164846746678752.

The previous prime is 165106631612561. The next prime is 165106631612729. The reversal of 165106631612621 is 126216136601561.

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 165106631612621 - 2⁴² = 160708585101517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165106631672621) 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, 32075696 + ... + 36865478.

It is an arithmetic number, because the mean of its divisors is an integer number (20670815779320).

Almost surely, 2^{165106631612621} is an apocalyptic number.

It is an amenable number.

165106631612621 is a deficient number, since it is larger than the sum of its proper divisors (259894621939).

165106631612621 is an equidigital number, since it uses as much as digits as its factorization.

165106631612621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4844035.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 165106631612621 in words is "one hundred sixty-five trillion, one hundred six billion, six hundred thirty-one million, six hundred twelve thousand, six hundred twenty-one".