61761780289 has 8 divisors (see below), whose sum is σ = 67388499360. Its totient is φ = 56137063200.

The previous prime is 61761780281. The next prime is 61761780307. The reversal of 61761780289 is 98208716716.

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 61761780289 - 2³ = 61761780281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61761780281) 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, 435619 + ... + 559720.

It is an arithmetic number, because the mean of its divisors is an integer number (8423562420).

Almost surely, 2^61761780289 is an apocalyptic number.

It is an amenable number.

61761780289 is a deficient number, since it is larger than the sum of its proper divisors (5626719071).

61761780289 is a wasteful number, since it uses less digits than its factorization.

61761780289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000991.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 61761780289 in words is "sixty-one billion, seven hundred sixty-one million, seven hundred eighty thousand, two hundred eighty-nine".