61180240409 has 2 divisors, whose sum is σ = 61180240410. Its totient is φ = 61180240408.

The previous prime is 61180240397. The next prime is 61180240493. The reversal of 61180240409 is 90404208116.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60594745600 + 585494809 = 246160^2 + 24197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61180240409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61180246409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30590120204 + 30590120205.

It is an arithmetic number, because the mean of its divisors is an integer number (30590120205).

Almost surely, 2^61180240409 is an apocalyptic number.

It is an amenable number.

61180240409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61180240409 is an equidigital number, since it uses as much as digits as its factorization.

61180240409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 61180240409 in words is "sixty-one billion, one hundred eighty million, two hundred forty thousand, four hundred nine".