61686888837499 has 2 divisors, whose sum is σ = 61686888837500. Its totient is φ = 61686888837498.

The previous prime is 61686888837443. The next prime is 61686888837517. The reversal of 61686888837499 is 99473888868616.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61686888837499 - 2⁹ = 61686888836987 is a prime.

It is not a weakly prime, because it can be changed into another prime (61686888877499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30843444418749 + 30843444418750.

It is an arithmetic number, because the mean of its divisors is an integer number (30843444418750).

Almost surely, 2^{61686888837499} is an apocalyptic number.

61686888837499 is a deficient number, since it is larger than the sum of its proper divisors (1).

61686888837499 is an equidigital number, since it uses as much as digits as its factorization.

61686888837499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48157949952, while the sum is 91.

The spelling of 61686888837499 in words is "sixty-one trillion, six hundred eighty-six billion, eight hundred eighty-eight million, eight hundred thirty-seven thousand, four hundred ninety-nine".