166997743 has 16 divisors (see below), whose sum is σ = 186302592. Its totient is φ = 148420000.

The previous prime is 166997741. The next prime is 166997759. The reversal of 166997743 is 347799661.

It is a cyclic number.

It is not a de Polignac number, because 166997743 - 2¹ = 166997741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166997741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91308 + ... + 93118.

It is an arithmetic number, because the mean of its divisors is an integer number (11643912).

Almost surely, 2^166997743 is an apocalyptic number.

166997743 is a deficient number, since it is larger than the sum of its proper divisors (19304849).

166997743 is a wasteful number, since it uses less digits than its factorization.

166997743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006.

The product of its digits is 1714608, while the sum is 52.

The square root of 166997743 is about 12922.7606570732. The cubic root of 166997743 is about 550.6853637843.

It can be divided in two parts, 16699 and 7743, that added together give a palindrome (24442).

The spelling of 166997743 in words is "one hundred sixty-six million, nine hundred ninety-seven thousand, seven hundred forty-three".