61688641581703 has 4 divisors (see below), whose sum is σ = 62174378917120. Its totient is φ = 61202904246288.

The previous prime is 61688641581689. The next prime is 61688641581727. The reversal of 61688641581703 is 30718514688616.

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-61688641581703 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 (61688641581793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242868667518 + ... + 242868667771.

It is an arithmetic number, because the mean of its divisors is an integer number (15543594729280).

Almost surely, 2^{61688641581703} is an apocalyptic number.

61688641581703 is a deficient number, since it is larger than the sum of its proper divisors (485737335417).

61688641581703 is a wasteful number, since it uses less digits than its factorization.

61688641581703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485737335416.

The product of its (nonzero) digits is 46448640, while the sum is 64.

The spelling of 61688641581703 in words is "sixty-one trillion, six hundred eighty-eight billion, six hundred forty-one million, five hundred eighty-one thousand, seven hundred three".