166375375949 has 2 divisors, whose sum is σ = 166375375950. Its totient is φ = 166375375948.

The previous prime is 166375375939. The next prime is 166375375973. The reversal of 166375375949 is 949573573661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122329959049 + 44045416900 = 349757^2 + 209870^2 .

It is a cyclic number.

It is not a de Polignac number, because 166375375949 - 2¹² = 166375371853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166375375939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83187687974 + 83187687975.

It is an arithmetic number, because the mean of its divisors is an integer number (83187687975).

Almost surely, 2^166375375949 is an apocalyptic number.

It is an amenable number.

166375375949 is a deficient number, since it is larger than the sum of its proper divisors (1).

166375375949 is an equidigital number, since it uses as much as digits as its factorization.

166375375949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128595600, while the sum is 65.

The spelling of 166375375949 in words is "one hundred sixty-six billion, three hundred seventy-five million, three hundred seventy-five thousand, nine hundred forty-nine".