61505409659 has 2 divisors, whose sum is σ = 61505409660. Its totient is φ = 61505409658.

The previous prime is 61505409613. The next prime is 61505409661. The reversal of 61505409659 is 95690450516.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61505409659 is a prime.

Together with 61505409661, 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 (61505439659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30752704829 + 30752704830.

It is an arithmetic number, because the mean of its divisors is an integer number (30752704830).

Almost surely, 2^61505409659 is an apocalyptic number.

61505409659 is a deficient number, since it is larger than the sum of its proper divisors (1).

61505409659 is an equidigital number, since it uses as much as digits as its factorization.

61505409659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The spelling of 61505409659 in words is "sixty-one billion, five hundred five million, four hundred nine thousand, six hundred fifty-nine".