61603459031809 has 2 divisors, whose sum is σ = 61603459031810. Its totient is φ = 61603459031808.

The previous prime is 61603459031749. The next prime is 61603459031887. The reversal of 61603459031809 is 90813095430616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58003882496784 + 3599576535025 = 7616028^2 + 1897255^2 .

It is a cyclic number.

It is not a de Polignac number, because 61603459031809 - 2²⁷ = 61603324814081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61603459031809.

It is not a weakly prime, because it can be changed into another prime (61603459031909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30801729515904 + 30801729515905.

It is an arithmetic number, because the mean of its divisors is an integer number (30801729515905).

Almost surely, 2^{61603459031809} is an apocalyptic number.

It is an amenable number.

61603459031809 is a deficient number, since it is larger than the sum of its proper divisors (1).

61603459031809 is an equidigital number, since it uses as much as digits as its factorization.

61603459031809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 61603459031809 in words is "sixty-one trillion, six hundred three billion, four hundred fifty-nine million, thirty-one thousand, eight hundred nine".