61165984409 has 2 divisors, whose sum is σ = 61165984410. Its totient is φ = 61165984408.

The previous prime is 61165984391. The next prime is 61165984417. The reversal of 61165984409 is 90448956116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36494371225 + 24671613184 = 191035^2 + 157072^2 .

It is a cyclic number.

It is not a de Polignac number, because 61165984409 - 2¹² = 61165980313 is a prime.

It is not a weakly prime, because it can be changed into another prime (61165984499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30582992204 + 30582992205.

It is an arithmetic number, because the mean of its divisors is an integer number (30582992205).

Almost surely, 2^61165984409 is an apocalyptic number.

It is an amenable number.

61165984409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61165984409 is an equidigital number, since it uses as much as digits as its factorization.

61165984409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 61165984409 in words is "sixty-one billion, one hundred sixty-five million, nine hundred eighty-four thousand, four hundred nine".