61788536329 has 9 divisors (see below), whose sum is σ = 66910612629. Its totient is φ = 57032589120.

The previous prime is 61788536281. The next prime is 61788536333. The reversal of 61788536329 is 92363588716.

The square root of 61788536329 is 248573.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 60140025 + 61728396304 = 7755^2 + 248452^2 .

It is not a de Polignac number, because 61788536329 - 2²¹ = 61786439177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61788536339) 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 8 ways as a sum of consecutive naturals, for example, 3221889 + ... + 3241009.

Almost surely, 2^61788536329 is an apocalyptic number.

61788536329 is the 248573-rd square number.

61788536329 is the 124287-th centered octagonal number.

It is an amenable number.

61788536329 is a deficient number, since it is larger than the sum of its proper divisors (5122076300).

61788536329 is an frugal number, since it uses more digits than its factorization.

61788536329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38268 (or 19134 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 58.

The spelling of 61788536329 in words is "sixty-one billion, seven hundred eighty-eight million, five hundred thirty-six thousand, three hundred twenty-nine".