550165161621 has 4 divisors (see below), whose sum is σ = 733553548832. Its totient is φ = 366776774412.

The previous prime is 550165161613. The next prime is 550165161643. The reversal of 550165161621 is 126161561055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 550165161621 - 2³ = 550165161613 is a prime.

It is a super-2 number, since 2×550165161621² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 550165161621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550165161121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91694193601 + ... + 91694193606.

It is an arithmetic number, because the mean of its divisors is an integer number (183388387208).

Almost surely, 2^550165161621 is an apocalyptic number.

It is an amenable number.

550165161621 is a deficient number, since it is larger than the sum of its proper divisors (183388387211).

550165161621 is a wasteful number, since it uses less digits than its factorization.

550165161621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183388387210.

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 550165161621 in words is "five hundred fifty billion, one hundred sixty-five million, one hundred sixty-one thousand, six hundred twenty-one".