166742081 has 16 divisors (see below), whose sum is σ = 195099840. Its totient is φ = 140886720.

The previous prime is 166742077. The next prime is 166742101. The reversal of 166742081 is 180247661.

It is not a de Polignac number, because 166742081 - 2² = 166742077 is a prime.

It is a super-2 number, since 2×166742081² = 55605843152421122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166742281) 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, 3551 + ... + 18603.

It is an arithmetic number, because the mean of its divisors is an integer number (12193740).

Almost surely, 2^166742081 is an apocalyptic number.

166742081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166742081 is a deficient number, since it is larger than the sum of its proper divisors (28357759).

166742081 is a wasteful number, since it uses less digits than its factorization.

166742081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15136.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 166742081 is about 12912.8649415999. The cubic root of 166742081 is about 550.4041998469.

It can be divided in two parts, 166 and 742081, that added together give a palindrome (742247).

The spelling of 166742081 in words is "one hundred sixty-six million, seven hundred forty-two thousand, eighty-one".