66536040251 has 2 divisors, whose sum is σ = 66536040252. Its totient is φ = 66536040250.

The previous prime is 66536040247. The next prime is 66536040269. The reversal of 66536040251 is 15204063566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66536040251 - 2² = 66536040247 is a prime.

It is not a weakly prime, because it can be changed into another prime (66536040211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33268020125 + 33268020126.

It is an arithmetic number, because the mean of its divisors is an integer number (33268020126).

Almost surely, 2^66536040251 is an apocalyptic number.

66536040251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66536040251 is an equidigital number, since it uses as much as digits as its factorization.

66536040251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 66536040251 in words is "sixty-six billion, five hundred thirty-six million, forty thousand, two hundred fifty-one".