61417716779 has 4 divisors (see below), whose sum is σ = 61418365080. Its totient is φ = 61417068480.

The previous prime is 61417716751. The next prime is 61417716791. The reversal of 61417716779 is 97761771416.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61417716779 - 2²⁴ = 61400939563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61417716749) 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, 151334 + ... + 381755.

It is an arithmetic number, because the mean of its divisors is an integer number (15354591270).

Almost surely, 2^61417716779 is an apocalyptic number.

61417716779 is a deficient number, since it is larger than the sum of its proper divisors (648301).

61417716779 is a wasteful number, since it uses less digits than its factorization.

61417716779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648300.

The product of its digits is 3111696, while the sum is 56.

The spelling of 61417716779 in words is "sixty-one billion, four hundred seventeen million, seven hundred sixteen thousand, seven hundred seventy-nine".