5205661003 has 4 divisors (see below), whose sum is σ = 5206127368. Its totient is φ = 5205194640.

The previous prime is 5205660991. The next prime is 5205661009. The reversal of 5205661003 is 3001665025.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5205661003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5205661009) 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, 216018 + ... + 238903.

It is an arithmetic number, because the mean of its divisors is an integer number (1301531842).

Almost surely, 2^5205661003 is an apocalyptic number.

5205661003 is a deficient number, since it is larger than the sum of its proper divisors (466365).

5205661003 is a wasteful number, since it uses less digits than its factorization.

5205661003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466364.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 5205661003 is about 72150.2668255634. The cubic root of 5205661003 is about 1733.1066726999.

The spelling of 5205661003 in words is "five billion, two hundred five million, six hundred sixty-one thousand, three".