61866420601499 has 2 divisors, whose sum is σ = 61866420601500. Its totient is φ = 61866420601498.

The previous prime is 61866420601411. The next prime is 61866420601543. The reversal of 61866420601499 is 99410602466816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61866420601499 - 2⁴⁰ = 60766908973723 is a prime.

It is a super-2 number, since 2×61866420601499² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61866420601199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30933210300749 + 30933210300750.

It is an arithmetic number, because the mean of its divisors is an integer number (30933210300750).

Almost surely, 2^{61866420601499} is an apocalyptic number.

61866420601499 is a deficient number, since it is larger than the sum of its proper divisors (1).

61866420601499 is an equidigital number, since it uses as much as digits as its factorization.

61866420601499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26873856, while the sum is 62.

The spelling of 61866420601499 in words is "sixty-one trillion, eight hundred sixty-six billion, four hundred twenty million, six hundred one thousand, four hundred ninety-nine".