61133749409 has 2 divisors, whose sum is σ = 61133749410. Its totient is φ = 61133749408.

The previous prime is 61133749403. The next prime is 61133749427. The reversal of 61133749409 is 90494733116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38192103184 + 22941646225 = 195428^2 + 151465^2 .

It is a cyclic number.

It is not a de Polignac number, because 61133749409 - 2¹⁶ = 61133683873 is a prime.

It is not a weakly prime, because it can be changed into another prime (61133749403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30566874704 + 30566874705.

It is an arithmetic number, because the mean of its divisors is an integer number (30566874705).

Almost surely, 2^61133749409 is an apocalyptic number.

It is an amenable number.

61133749409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61133749409 is an equidigital number, since it uses as much as digits as its factorization.

61133749409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 61133749409 in words is "sixty-one billion, one hundred thirty-three million, seven hundred forty-nine thousand, four hundred nine".