2661720103 has 12 divisors (see below), whose sum is σ = 3179980048. Its totient is φ = 2182276800.

The previous prime is 2661720071. The next prime is 2661720119. The reversal of 2661720103 is 3010271662.

It is not a de Polignac number, because 2661720103 - 2⁵ = 2661720071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661720143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355698 + ... + 363103.

Almost surely, 2^2661720103 is an apocalyptic number.

2661720103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2661720103 is a deficient number, since it is larger than the sum of its proper divisors (518259945).

2661720103 is an equidigital number, since it uses as much as digits as its factorization.

2661720103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718854 (or 718831 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 2661720103 is about 51591.8608212575. The cubic root of 2661720103 is about 1385.8645790603.

Adding to 2661720103 its reverse (3010271662), we get a palindrome (5671991765).

The spelling of 2661720103 in words is "two billion, six hundred sixty-one million, seven hundred twenty thousand, one hundred three".