61893559009 has 2 divisors, whose sum is σ = 61893559010. Its totient is φ = 61893559008.

The previous prime is 61893558971. The next prime is 61893559019. The reversal of 61893559009 is 90095539816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37675974609 + 24217584400 = 194103^2 + 155620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61893559009 is a prime.

It is not a weakly prime, because it can be changed into another prime (61893559019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30946779504 + 30946779505.

It is an arithmetic number, because the mean of its divisors is an integer number (30946779505).

Almost surely, 2^61893559009 is an apocalyptic number.

It is an amenable number.

61893559009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61893559009 is an equidigital number, since it uses as much as digits as its factorization.

61893559009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2624400, while the sum is 55.

The spelling of 61893559009 in words is "sixty-one billion, eight hundred ninety-three million, five hundred fifty-nine thousand, nine".