165012151550521 has 16 divisors (see below), whose sum is σ = 181309805651520. Its totient is φ = 148930606759680.

The previous prime is 165012151550497. The next prime is 165012151550531. The reversal of 165012151550521 is 125055151210561.

It is a cyclic number.

It is not a de Polignac number, because 165012151550521 - 2¹¹ = 165012151548473 is a prime.

It is a super-2 number, since 2×165012151550521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165012151550531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222216565 + ... + 222957901.

It is an arithmetic number, because the mean of its divisors is an integer number (11331862853220).

Almost surely, 2^{165012151550521} is an apocalyptic number.

165012151550521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165012151550521 is a deficient number, since it is larger than the sum of its proper divisors (16297654100999).

165012151550521 is a wasteful number, since it uses less digits than its factorization.

165012151550521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887064.

The product of its (nonzero) digits is 75000, while the sum is 40.

The spelling of 165012151550521 in words is "one hundred sixty-five trillion, twelve billion, one hundred fifty-one million, five hundred fifty thousand, five hundred twenty-one".