166505770754737 has 2 divisors, whose sum is σ = 166505770754738. Its totient is φ = 166505770754736.

The previous prime is 166505770754717. The next prime is 166505770754753. The reversal of 166505770754737 is 737457077505661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142963129244961 + 23542641509776 = 11956719^2 + 4852076^2 .

It is a cyclic number.

It is not a de Polignac number, because 166505770754737 - 2²³ = 166505762366129 is a prime.

It is not a weakly prime, because it can be changed into another prime (166505770754707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83252885377368 + 83252885377369.

It is an arithmetic number, because the mean of its divisors is an integer number (83252885377369).

Almost surely, 2^{166505770754737} is an apocalyptic number.

It is an amenable number.

166505770754737 is a deficient number, since it is larger than the sum of its proper divisors (1).

166505770754737 is an equidigital number, since it uses as much as digits as its factorization.

166505770754737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907578000, while the sum is 70.

The spelling of 166505770754737 in words is "one hundred sixty-six trillion, five hundred five billion, seven hundred seventy million, seven hundred fifty-four thousand, seven hundred thirty-seven".