166640513 has 8 divisors (see below), whose sum is σ = 179865000. Its totient is φ = 153474048.

The previous prime is 166640501. The next prime is 166640561. The reversal of 166640513 is 315046661.

It can be written as a sum of positive squares in 4 ways, for example, as 1183744 + 165456769 = 1088^2 + 12863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166640513 - 2¹⁰ = 166639489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166640513.

It is not an unprimeable number, because it can be changed into a prime (166640413) 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, 8438 + ... + 20111.

It is an arithmetic number, because the mean of its divisors is an integer number (22483125).

Almost surely, 2^166640513 is an apocalyptic number.

166640513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

166640513 is a deficient number, since it is larger than the sum of its proper divisors (13224487).

166640513 is a wasteful number, since it uses less digits than its factorization.

166640513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29011.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 166640513 is about 12908.9315204629. The cubic root of 166640513 is about 550.2924208084.

The spelling of 166640513 in words is "one hundred sixty-six million, six hundred forty thousand, five hundred thirteen".