66737473849 has 2 divisors, whose sum is σ = 66737473850. Its totient is φ = 66737473848.

The previous prime is 66737473753. The next prime is 66737473897. The reversal of 66737473849 is 94837473766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59557962025 + 7179511824 = 244045^2 + 84732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66737473849 is a prime.

It is not a weakly prime, because it can be changed into another prime (66737473949) 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, 33368736924 + 33368736925.

It is an arithmetic number, because the mean of its divisors is an integer number (33368736925).

Almost surely, 2^66737473849 is an apocalyptic number.

It is an amenable number.

66737473849 is a deficient number, since it is larger than the sum of its proper divisors (1).

66737473849 is an equidigital number, since it uses as much as digits as its factorization.

66737473849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128024064, while the sum is 64.

The spelling of 66737473849 in words is "sixty-six billion, seven hundred thirty-seven million, four hundred seventy-three thousand, eight hundred forty-nine".