503665645 has 16 divisors (see below), whose sum is σ = 709411968. Its totient is φ = 336035520.

The previous prime is 503665639. The next prime is 503665667. The reversal of 503665645 is 546566305.

It is a happy number.

It is not a de Polignac number, because 503665645 - 2¹¹ = 503663597 is a prime.

It is a super-3 number, since 3×503665645³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 503665598 and 503665607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193171 + ... + 195760.

It is an arithmetic number, because the mean of its divisors is an integer number (44338248).

Almost surely, 2^503665645 is an apocalyptic number.

It is an amenable number.

503665645 is a deficient number, since it is larger than the sum of its proper divisors (205746323).

503665645 is a wasteful number, since it uses less digits than its factorization.

503665645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388980.

The product of its (nonzero) digits is 324000, while the sum is 40.

The square root of 503665645 is about 22442.4964074855. The cubic root of 503665645 is about 795.6354214758.

The spelling of 503665645 in words is "five hundred three million, six hundred sixty-five thousand, six hundred forty-five".