61004554081 has 9 divisors (see below), whose sum is σ = 61262260371. Its totient is φ = 60747930432.

The previous prime is 61004554067. The next prime is 61004554097. The reversal of 61004554081 is 18045540016.

The square root of 61004554081 is 246991.

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

It can be written as a sum of positive squares in only one way, i.e., 19964277025 + 41040277056 = 141295^2 + 202584^2 .

It is not a de Polignac number, because 61004554081 - 2¹¹ = 61004552033 is a prime.

It is a super-2 number, since 2×61004554081² (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 (61004554021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 90645361 + ... + 90646033.

It is an arithmetic number, because the mean of its divisors is an integer number (6806917819).

Almost surely, 2^61004554081 is an apocalyptic number.

61004554081 is the 246991-st square number.

61004554081 is the 123496-th centered octagonal number.

It is an amenable number.

61004554081 is a deficient number, since it is larger than the sum of its proper divisors (257706290).

61004554081 is an frugal number, since it uses more digits than its factorization.

61004554081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 61004554081 in words is "sixty-one billion, four million, five hundred fifty-four thousand, eighty-one".