61281716503 has 4 divisors (see below), whose sum is σ = 70036247440. Its totient is φ = 52527185568.

The previous prime is 61281716477. The next prime is 61281716579. The reversal of 61281716503 is 30561718216.

It is a happy number.

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-61281716503 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 (61281716593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4377265458 + ... + 4377265471.

It is an arithmetic number, because the mean of its divisors is an integer number (17509061860).

Almost surely, 2^61281716503 is an apocalyptic number.

61281716503 is a deficient number, since it is larger than the sum of its proper divisors (8754530937).

61281716503 is an equidigital number, since it uses as much as digits as its factorization.

61281716503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8754530936.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 61281716503 in words is "sixty-one billion, two hundred eighty-one million, seven hundred sixteen thousand, five hundred three".