66732610397 has 2 divisors, whose sum is σ = 66732610398. Its totient is φ = 66732610396.

The previous prime is 66732610393. The next prime is 66732610433. The reversal of 66732610397 is 79301623766.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64879221796 + 1853388601 = 254714^2 + 43051^2 .

It is a cyclic number.

It is not a de Polignac number, because 66732610397 - 2² = 66732610393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66732610393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33366305198 + 33366305199.

It is an arithmetic number, because the mean of its divisors is an integer number (33366305199).

Almost surely, 2^66732610397 is an apocalyptic number.

It is an amenable number.

66732610397 is a deficient number, since it is larger than the sum of its proper divisors (1).

66732610397 is an equidigital number, since it uses as much as digits as its factorization.

66732610397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 50.

The spelling of 66732610397 in words is "sixty-six billion, seven hundred thirty-two million, six hundred ten thousand, three hundred ninety-seven".