61787600009 has 2 divisors, whose sum is σ = 61787600010. Its totient is φ = 61787600008.

The previous prime is 61787599949. The next prime is 61787600011. The reversal of 61787600009 is 90000678716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50663257225 + 11124342784 = 225085^2 + 105472^2 .

It is a cyclic number.

It is not a de Polignac number, because 61787600009 - 2¹² = 61787595913 is a prime.

Together with 61787600011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61787600099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30893800004 + 30893800005.

It is an arithmetic number, because the mean of its divisors is an integer number (30893800005).

Almost surely, 2^61787600009 is an apocalyptic number.

It is an amenable number.

61787600009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61787600009 is an equidigital number, since it uses as much as digits as its factorization.

61787600009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 61787600009 in words is "sixty-one billion, seven hundred eighty-seven million, six hundred thousand, nine".