66357670549 has 2 divisors, whose sum is σ = 66357670550. Its totient is φ = 66357670548.

The previous prime is 66357670537. The next prime is 66357670559. The reversal of 66357670549 is 94507675366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60135300625 + 6222369924 = 245225^2 + 78882^2 .

It is a cyclic number.

It is not a de Polignac number, because 66357670549 - 2⁵ = 66357670517 is a prime.

It is a super-2 number, since 2×66357670549² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66357670493 and 66357670502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66357670559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33178835274 + 33178835275.

It is an arithmetic number, because the mean of its divisors is an integer number (33178835275).

Almost surely, 2^66357670549 is an apocalyptic number.

It is an amenable number.

66357670549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66357670549 is an equidigital number, since it uses as much as digits as its factorization.

66357670549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28576800, while the sum is 58.

The spelling of 66357670549 in words is "sixty-six billion, three hundred fifty-seven million, six hundred seventy thousand, five hundred forty-nine".