61779462289 has 8 divisors (see below), whose sum is σ = 67181482728. Its totient is φ = 56573879040.

The previous prime is 61779462287. The next prime is 61779462299. The reversal of 61779462289 is 98226497716.

It can be written as a sum of positive squares in 4 ways, for example, as 21180436225 + 40599026064 = 145535^2 + 201492^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61779462289 - 2¹ = 61779462287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61779462287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49108642 + ... + 49109899.

It is an arithmetic number, because the mean of its divisors is an integer number (8397685341).

Almost surely, 2^61779462289 is an apocalyptic number.

It is an amenable number.

61779462289 is a deficient number, since it is larger than the sum of its proper divisors (5402020439).

61779462289 is a wasteful number, since it uses less digits than its factorization.

61779462289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98218595.

The product of its digits is 18289152, while the sum is 61.

The spelling of 61779462289 in words is "sixty-one billion, seven hundred seventy-nine million, four hundred sixty-two thousand, two hundred eighty-nine".