165220651135646 has 8 divisors (see below), whose sum is σ = 250284748750344. Its totient is φ = 81792401552200.

The previous prime is 165220651135633. The next prime is 165220651135649. The reversal of 165220651135646 is 646531156022561.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165220651135649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408962007560 + ... + 408962007963.

It is an arithmetic number, because the mean of its divisors is an integer number (31285593593793).

Almost surely, 2^{165220651135646} is an apocalyptic number.

165220651135646 is a deficient number, since it is larger than the sum of its proper divisors (85064097614698).

165220651135646 is a wasteful number, since it uses less digits than its factorization.

165220651135646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817924015626.

The product of its (nonzero) digits is 7776000, while the sum is 53.

The spelling of 165220651135646 in words is "one hundred sixty-five trillion, two hundred twenty billion, six hundred fifty-one million, one hundred thirty-five thousand, six hundred forty-six".