166245640 has 32 divisors (see below), whose sum is σ = 408058560. Its totient is φ = 60452800.

The previous prime is 166245637. The next prime is 166245641. The reversal of 166245640 is 46542661.

It is a super-2 number, since 2×166245640² = 55275225638019200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166245596 and 166245605.

It is not an unprimeable number, because it can be changed into a prime (166245641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188476 + ... + 189355.

It is an arithmetic number, because the mean of its divisors is an integer number (12751830).

Almost surely, 2^166245640 is an apocalyptic number.

166245640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166245640 is an abundant number, since it is smaller than the sum of its proper divisors (241812920).

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

166245640 is a wasteful number, since it uses less digits than its factorization.

166245640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377853 (or 377849 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 166245640 is about 12893.6278835710. The cubic root of 166245640 is about 549.8574175855.

The spelling of 166245640 in words is "one hundred sixty-six million, two hundred forty-five thousand, six hundred forty".