136566549971 has 2 divisors, whose sum is σ = 136566549972. Its totient is φ = 136566549970.

The previous prime is 136566549967. The next prime is 136566550031. The reversal of 136566549971 is 179945665631.

It is a weak prime.

It is an emirp because it is prime and its reverse (179945665631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136566549971 - 2² = 136566549967 is a prime.

It is not a weakly prime, because it can be changed into another prime (136566549671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68283274985 + 68283274986.

It is an arithmetic number, because the mean of its divisors is an integer number (68283274986).

Almost surely, 2^136566549971 is an apocalyptic number.

136566549971 is a deficient number, since it is larger than the sum of its proper divisors (1).

136566549971 is an equidigital number, since it uses as much as digits as its factorization.

136566549971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36741600, while the sum is 62.

The spelling of 136566549971 in words is "one hundred thirty-six billion, five hundred sixty-six million, five hundred forty-nine thousand, nine hundred seventy-one".