166520143250 has 32 divisors (see below), whose sum is σ = 311749938864. Its totient is φ = 66602880000.

The previous prime is 166520143177. The next prime is 166520143259. The reversal of 166520143250 is 52341025661.

It can be written as a sum of positive squares in 8 ways, for example, as 6768846529 + 159751296721 = 82273^2 + 399689^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 166520143250.

It is not an unprimeable number, because it can be changed into a prime (166520143259) 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, 5954300 + ... + 5982200.

Almost surely, 2^166520143250 is an apocalyptic number.

166520143250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166520143250 is a deficient number, since it is larger than the sum of its proper divisors (145229795614).

166520143250 is a wasteful number, since it uses less digits than its factorization.

166520143250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51791 (or 51781 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 166520143250 in words is "one hundred sixty-six billion, five hundred twenty million, one hundred forty-three thousand, two hundred fifty".