545021749509 has 4 divisors (see below), whose sum is σ = 726695666016. Its totient is φ = 363347833004.

The previous prime is 545021749471. The next prime is 545021749583. The reversal of 545021749509 is 905947120545.

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 a cyclic number.

It is not a de Polignac number, because 545021749509 - 2⁷ = 545021749381 is a prime.

It is a super-2 number, since 2×545021749509² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545021747509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90836958249 + ... + 90836958254.

It is an arithmetic number, because the mean of its divisors is an integer number (181673916504).

Almost surely, 2^545021749509 is an apocalyptic number.

It is an amenable number.

545021749509 is a deficient number, since it is larger than the sum of its proper divisors (181673916507).

545021749509 is a wasteful number, since it uses less digits than its factorization.

545021749509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181673916506.

The product of its (nonzero) digits is 2268000, while the sum is 51.

The spelling of 545021749509 in words is "five hundred forty-five billion, twenty-one million, seven hundred forty-nine thousand, five hundred nine".