61721532959 has 2 divisors, whose sum is σ = 61721532960. Its totient is φ = 61721532958.

The previous prime is 61721532863. The next prime is 61721532973. The reversal of 61721532959 is 95923512716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61721532959 - 2²⁴ = 61704755743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61721532989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30860766479 + 30860766480.

It is an arithmetic number, because the mean of its divisors is an integer number (30860766480).

Almost surely, 2^61721532959 is an apocalyptic number.

61721532959 is a deficient number, since it is larger than the sum of its proper divisors (1).

61721532959 is an equidigital number, since it uses as much as digits as its factorization.

61721532959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 50.

The spelling of 61721532959 in words is "sixty-one billion, seven hundred twenty-one million, five hundred thirty-two thousand, nine hundred fifty-nine".