545421645 has 24 divisors (see below), whose sum is σ = 958718592. Its totient is φ = 286792800.

The previous prime is 545421623. The next prime is 545421649. The reversal of 545421645 is 546124545.

545421645 is a `hidden beast` number, since 5 + 4 + 5 + 4 + 2 + 1 + 645 = 666.

It is not a de Polignac number, because 545421645 - 2¹⁷ = 545290573 is a prime.

It is a super-3 number, since 3×545421645³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545421649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82161 + ... + 88550.

It is an arithmetic number, because the mean of its divisors is an integer number (39946608).

Almost surely, 2^545421645 is an apocalyptic number.

It is an amenable number.

545421645 is a deficient number, since it is larger than the sum of its proper divisors (413296947).

545421645 is a wasteful number, since it uses less digits than its factorization.

545421645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170793 (or 170790 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The square root of 545421645 is about 23354.2639575731. The cubic root of 545421645 is about 817.0415126822.

The spelling of 545421645 in words is "five hundred forty-five million, four hundred twenty-one thousand, six hundred forty-five".