61005400009 has 2 divisors, whose sum is σ = 61005400010. Its totient is φ = 61005400008.

The previous prime is 61005399971. The next prime is 61005400091. The reversal of 61005400009 is 90000450016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50724048400 + 10281351609 = 225220^2 + 101397^2 .

It is a cyclic number.

It is not a de Polignac number, because 61005400009 - 2¹³ = 61005391817 is a prime.

It is not a weakly prime, because it can be changed into another prime (61005403009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30502700004 + 30502700005.

It is an arithmetic number, because the mean of its divisors is an integer number (30502700005).

Almost surely, 2^61005400009 is an apocalyptic number.

It is an amenable number.

61005400009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61005400009 is an equidigital number, since it uses as much as digits as its factorization.

61005400009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 61005400009 in words is "sixty-one billion, five million, four hundred thousand, nine".