61811929716568 has 16 divisors (see below), whose sum is σ = 115899198155280. Its totient is φ = 30905476875168.

The previous prime is 61811929716533. The next prime is 61811929716601. The reversal of 61811929716568 is 86561792911816.

It is a junction number, because it is equal to n+sod(n) for n = 61811929716497 and 61811929716506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60459271 + ... + 61473142.

It is an arithmetic number, because the mean of its divisors is an integer number (7243699884705).

Almost surely, 2^{61811929716568} is an apocalyptic number.

It is an amenable number.

61811929716568 is a deficient number, since it is larger than the sum of its proper divisors (54087268438712).

61811929716568 is a wasteful number, since it uses less digits than its factorization.

61811929716568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121995786 (or 121995782 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 70.

The spelling of 61811929716568 in words is "sixty-one trillion, eight hundred eleven billion, nine hundred twenty-nine million, seven hundred sixteen thousand, five hundred sixty-eight".