61686890934659 has 2 divisors, whose sum is σ = 61686890934660. Its totient is φ = 61686890934658.

The previous prime is 61686890934637. The next prime is 61686890934667. The reversal of 61686890934659 is 95643909868616.

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-61686890934659 is a prime.

It is not a weakly prime, because it can be changed into another prime (61686890034659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30843445467329 + 30843445467330.

It is an arithmetic number, because the mean of its divisors is an integer number (30843445467330).

Almost surely, 2^{61686890934659} is an apocalyptic number.

61686890934659 is a deficient number, since it is larger than the sum of its proper divisors (1).

61686890934659 is an equidigital number, since it uses as much as digits as its factorization.

61686890934659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3627970560, while the sum is 80.

The spelling of 61686890934659 in words is "sixty-one trillion, six hundred eighty-six billion, eight hundred ninety million, nine hundred thirty-four thousand, six hundred fifty-nine".