166720540 has 36 divisors (see below), whose sum is σ = 407276856. Its totient is φ = 57160992.

The previous prime is 166720531. The next prime is 166720577. The reversal of 166720540 is 45027661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84082 + ... + 86041.

It is an arithmetic number, because the mean of its divisors is an integer number (11313246).

Almost surely, 2^166720540 is an apocalyptic number.

166720540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166720540 is an abundant number, since it is smaller than the sum of its proper divisors (240556316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166720540 is a wasteful number, since it uses less digits than its factorization.

166720540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170146 (or 170137 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 166720540 is about 12912.0308240029. The cubic root of 166720540 is about 550.3804970372.

The spelling of 166720540 in words is "one hundred sixty-six million, seven hundred twenty thousand, five hundred forty".