166537501 has 12 divisors (see below), whose sum is σ = 183745908. Its totient is φ = 150818304.

The previous prime is 166537499. The next prime is 166537523. The reversal of 166537501 is 105735661.

It can be written as a sum of positive squares in 6 ways, for example, as 9060100 + 157477401 = 3010^2 + 12549^2 .

It is not a de Polignac number, because 166537501 - 2¹ = 166537499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166537541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340 + ... + 18253.

It is an arithmetic number, because the mean of its divisors is an integer number (15312159).

Almost surely, 2^166537501 is an apocalyptic number.

It is an amenable number.

166537501 is a deficient number, since it is larger than the sum of its proper divisors (17208407).

166537501 is a wasteful number, since it uses less digits than its factorization.

166537501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18672 (or 18659 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 166537501 is about 12904.9409529839. The cubic root of 166537501 is about 550.1790061961.

The spelling of 166537501 in words is "one hundred sixty-six million, five hundred thirty-seven thousand, five hundred one".