545660121173 has 4 divisors (see below), whose sum is σ = 545708348460. Its totient is φ = 545611893888.

The previous prime is 545660121169. The next prime is 545660121217. The reversal of 545660121173 is 371121066545.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 371121066545 = 5 ⋅74224213309.

It can be written as a sum of positive squares in 2 ways, for example, as 429925441969 + 115734679204 = 655687^2 + 340198^2 .

It is a cyclic number.

It is not a de Polignac number, because 545660121173 - 2² = 545660121169 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 545660121173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545660121103) 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, 24096668 + ... + 24119301.

It is an arithmetic number, because the mean of its divisors is an integer number (136427087115).

Almost surely, 2^545660121173 is an apocalyptic number.

It is an amenable number.

545660121173 is a deficient number, since it is larger than the sum of its proper divisors (48227287).

545660121173 is a wasteful number, since it uses less digits than its factorization.

545660121173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48227286.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 545660121173 in words is "five hundred forty-five billion, six hundred sixty million, one hundred twenty-one thousand, one hundred seventy-three".