166939757953 has 2 divisors, whose sum is σ = 166939757954. Its totient is φ = 166939757952.

The previous prime is 166939757951. The next prime is 166939757977. The reversal of 166939757953 is 359757939661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99012803569 + 67926954384 = 314663^2 + 260628^2 .

It is a cyclic number.

It is not a de Polignac number, because 166939757953 - 2¹ = 166939757951 is a prime.

Together with 166939757951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166939757951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83469878976 + 83469878977.

It is an arithmetic number, because the mean of its divisors is an integer number (83469878977).

Almost surely, 2^166939757953 is an apocalyptic number.

It is an amenable number.

166939757953 is a deficient number, since it is larger than the sum of its proper divisors (1).

166939757953 is an equidigital number, since it uses as much as digits as its factorization.

166939757953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 289340100, while the sum is 70.

The spelling of 166939757953 in words is "one hundred sixty-six billion, nine hundred thirty-nine million, seven hundred fifty-seven thousand, nine hundred fifty-three".