166773553 has 4 divisors (see below), whose sum is σ = 176583780. Its totient is φ = 156963328.

The previous prime is 166773547. The next prime is 166773569. The reversal of 166773553 is 355377661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355377661 = 5347 ⋅66463.

It can be written as a sum of positive squares in 2 ways, for example, as 86992929 + 79780624 = 9327^2 + 8932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166773553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166773053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4905088 + ... + 4905121.

It is an arithmetic number, because the mean of its divisors is an integer number (44145945).

Almost surely, 2^166773553 is an apocalyptic number.

It is an amenable number.

166773553 is a deficient number, since it is larger than the sum of its proper divisors (9810227).

166773553 is an equidigital number, since it uses as much as digits as its factorization.

166773553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9810226.

The product of its digits is 396900, while the sum is 43.

The square root of 166773553 is about 12914.0835137458. The cubic root of 166773553 is about 550.4388266413.

The spelling of 166773553 in words is "one hundred sixty-six million, seven hundred seventy-three thousand, five hundred fifty-three".