545253106521 has 4 divisors (see below), whose sum is σ = 727004142032. Its totient is φ = 363502071012.

The previous prime is 545253106507. The next prime is 545253106523. The reversal of 545253106521 is 125601352545.

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 545253106521 - 2²² = 545248912217 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 545253106521.

It is not an unprimeable number, because it can be changed into a prime (545253106523) 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, 90875517751 + ... + 90875517756.

It is an arithmetic number, because the mean of its divisors is an integer number (181751035508).

Almost surely, 2^545253106521 is an apocalyptic number.

It is an amenable number.

545253106521 is a deficient number, since it is larger than the sum of its proper divisors (181751035511).

545253106521 is a wasteful number, since it uses less digits than its factorization.

545253106521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181751035510.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 545253106521 in words is "five hundred forty-five billion, two hundred fifty-three million, one hundred six thousand, five hundred twenty-one".