545215123521 has 8 divisors (see below), whose sum is σ = 807726108960. Its totient is φ = 363476748996.

The previous prime is 545215123513. The next prime is 545215123549. The reversal of 545215123521 is 125321512545.

545215123521 is a `hidden beast` number, since 5 + 4 + 5 + 2 + 1 + 5 + 123 + 521 = 666.

It is not a de Polignac number, because 545215123521 - 2³ = 545215123513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (545215123021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10096576335 + ... + 10096576388.

It is an arithmetic number, because the mean of its divisors is an integer number (100965763620).

Almost surely, 2^545215123521 is an apocalyptic number.

It is an amenable number.

545215123521 is a deficient number, since it is larger than the sum of its proper divisors (262510985439).

545215123521 is a wasteful number, since it uses less digits than its factorization.

545215123521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20193152732 (or 20193152726 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The spelling of 545215123521 in words is "five hundred forty-five billion, two hundred fifteen million, one hundred twenty-three thousand, five hundred twenty-one".