61717888541 has 4 divisors (see below), whose sum is σ = 61718388000. Its totient is φ = 61717389084.

The previous prime is 61717888523. The next prime is 61717888553. The reversal of 61717888541 is 14588871716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61717888541 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 (61717848541) 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, 86720 + ... + 361878.

It is an arithmetic number, because the mean of its divisors is an integer number (15429597000).

Almost surely, 2^61717888541 is an apocalyptic number.

It is an amenable number.

61717888541 is a deficient number, since it is larger than the sum of its proper divisors (499459).

61717888541 is a wasteful number, since it uses less digits than its factorization.

61717888541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499458.

The product of its digits is 3010560, while the sum is 56.

The spelling of 61717888541 in words is "sixty-one billion, seven hundred seventeen million, eight hundred eighty-eight thousand, five hundred forty-one".