165072120621 has 16 divisors (see below), whose sum is σ = 221095914624. Its totient is φ = 109548440064.

The previous prime is 165072120559. The next prime is 165072120637. The reversal of 165072120621 is 126021270561.

165072120621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165072120621 - 2¹⁵ = 165072087853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165072120221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2997285 + ... + 3051861.

It is an arithmetic number, because the mean of its divisors is an integer number (13818494664).

Almost surely, 2^165072120621 is an apocalyptic number.

It is an amenable number.

165072120621 is a deficient number, since it is larger than the sum of its proper divisors (56023794003).

165072120621 is a wasteful number, since it uses less digits than its factorization.

165072120621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59140.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 165072120621 in words is "one hundred sixty-five billion, seventy-two million, one hundred twenty thousand, six hundred twenty-one".