2666406503 has 4 divisors (see below), whose sum is σ = 2752419648. Its totient is φ = 2580393360.

The previous prime is 2666406487. The next prime is 2666406511. The reversal of 2666406503 is 3056046662.

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

It is a cyclic number.

It is not a de Polignac number, because 2666406503 - 2⁴ = 2666406487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666402503) 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, 43006526 + ... + 43006587.

It is an arithmetic number, because the mean of its divisors is an integer number (688104912).

Almost surely, 2^2666406503 is an apocalyptic number.

2666406503 is a deficient number, since it is larger than the sum of its proper divisors (86013145).

2666406503 is an equidigital number, since it uses as much as digits as its factorization.

2666406503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86013144.

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 2666406503 is about 51637.2588641186. The cubic root of 2666406503 is about 1386.6774503818.

The spelling of 2666406503 in words is "two billion, six hundred sixty-six million, four hundred six thousand, five hundred three".