66574015801 has 2 divisors, whose sum is σ = 66574015802. Its totient is φ = 66574015800.

The previous prime is 66574015799. The next prime is 66574015817. The reversal of 66574015801 is 10851047566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44840180025 + 21733835776 = 211755^2 + 147424^2 .

It is a cyclic number.

It is not a de Polignac number, because 66574015801 - 2¹ = 66574015799 is a prime.

Together with 66574015799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66574045801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33287007900 + 33287007901.

It is an arithmetic number, because the mean of its divisors is an integer number (33287007901).

Almost surely, 2^66574015801 is an apocalyptic number.

It is an amenable number.

66574015801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66574015801 is an equidigital number, since it uses as much as digits as its factorization.

66574015801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 66574015801 in words is "sixty-six billion, five hundred seventy-four million, fifteen thousand, eight hundred one".