61734506779 has 4 divisors (see below), whose sum is σ = 67346734680. Its totient is φ = 56122278880.

The previous prime is 61734506761. The next prime is 61734506789. The reversal of 61734506779 is 97760543716.

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-61734506779 is a prime.

It is a super-2 number, since 2×61734506779² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61734506759) 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, 2806113934 + ... + 2806113955.

It is an arithmetic number, because the mean of its divisors is an integer number (16836683670).

Almost surely, 2^61734506779 is an apocalyptic number.

61734506779 is a deficient number, since it is larger than the sum of its proper divisors (5612227901).

61734506779 is a wasteful number, since it uses less digits than its factorization.

61734506779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5612227900.

The product of its (nonzero) digits is 6667920, while the sum is 55.

The spelling of 61734506779 in words is "sixty-one billion, seven hundred thirty-four million, five hundred six thousand, seven hundred seventy-nine".