620121802165 has 8 divisors (see below), whose sum is σ = 749826668448. Its totient is φ = 492310437840.

The previous prime is 620121802141. The next prime is 620121802169. The reversal of 620121802165 is 561208121026.

It is a happy number.

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

It is not a de Polignac number, because 620121802165 - 2¹⁷ = 620121671093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620121802165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620121802169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473374767 + ... + 473376076.

It is an arithmetic number, because the mean of its divisors is an integer number (93728333556).

Almost surely, 2^620121802165 is an apocalyptic number.

It is an amenable number.

620121802165 is a deficient number, since it is larger than the sum of its proper divisors (129704866283).

620121802165 is a wasteful number, since it uses less digits than its factorization.

620121802165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946750979.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 620121802165 in words is "six hundred twenty billion, one hundred twenty-one million, eight hundred two thousand, one hundred sixty-five".