503661745 has 4 divisors (see below), whose sum is σ = 604394100. Its totient is φ = 402929392.

The previous prime is 503661707. The next prime is 503661761. The reversal of 503661745 is 547166305.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 357928561 + 145733184 = 18919^2 + 12072^2 .

It is a cyclic number.

It is not a de Polignac number, because 503661745 - 2⁷ = 503661617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50366170 + ... + 50366179.

It is an arithmetic number, because the mean of its divisors is an integer number (151098525).

Almost surely, 2^503661745 is an apocalyptic number.

It is an amenable number.

503661745 is a deficient number, since it is larger than the sum of its proper divisors (100732355).

503661745 is a wasteful number, since it uses less digits than its factorization.

503661745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100732354.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 503661745 is about 22442.4095185878. The cubic root of 503661745 is about 795.6333678739.

The spelling of 503661745 in words is "five hundred three million, six hundred sixty-one thousand, seven hundred forty-five".