61771500047 has 2 divisors, whose sum is σ = 61771500048. Its totient is φ = 61771500046.

The previous prime is 61771499987. The next prime is 61771500137. The reversal of 61771500047 is 74000517716.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61771500047 - 2⁶ = 61771499983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61771500247) 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, 30885750023 + 30885750024.

It is an arithmetic number, because the mean of its divisors is an integer number (30885750024).

Almost surely, 2^61771500047 is an apocalyptic number.

61771500047 is a deficient number, since it is larger than the sum of its proper divisors (1).

61771500047 is an equidigital number, since it uses as much as digits as its factorization.

61771500047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41160, while the sum is 38.

The spelling of 61771500047 in words is "sixty-one billion, seven hundred seventy-one million, five hundred thousand, forty-seven".