166260640 has 192 divisors, whose sum is σ = 509725440. Its totient is φ = 49766400.

The previous prime is 166260631. The next prime is 166260649. The reversal of 166260640 is 46062661.

It is an interprime number because it is at equal distance from previous prime (166260631) and next prime (166260649).

It is not an unprimeable number, because it can be changed into a prime (166260649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276340 + ... + 276940.

It is an arithmetic number, because the mean of its divisors is an integer number (2654820).

Almost surely, 2^166260640 is an apocalyptic number.

166260640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166260640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254862720).

166260640 is an abundant number, since it is smaller than the sum of its proper divisors (343464800).

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

166260640 is a wasteful number, since it uses less digits than its factorization.

166260640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 166260640 is about 12894.2095531289. The cubic root of 166260640 is about 549.8739545870.

The spelling of 166260640 in words is "one hundred sixty-six million, two hundred sixty thousand, six hundred forty".