166323537 has 32 divisors (see below), whose sum is σ = 253872000. Its totient is φ = 108918432.

The previous prime is 166323523. The next prime is 166323541. The reversal of 166323537 is 735323661.

166323537 is a `hidden beast` number, since 16 + 632 + 3 + 5 + 3 + 7 = 666.

It is not a de Polignac number, because 166323537 - 2¹⁵ = 166290769 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166323517) 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, 128389 + ... + 129677.

It is an arithmetic number, because the mean of its divisors is an integer number (7933500).

Almost surely, 2^166323537 is an apocalyptic number.

It is an amenable number.

166323537 is a deficient number, since it is larger than the sum of its proper divisors (87548463).

166323537 is an frugal number, since it uses more digits than its factorization.

166323537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369 (or 1351 counting only the distinct ones).

The product of its digits is 68040, while the sum is 36.

The square root of 166323537 is about 12896.6482855043. The cubic root of 166323537 is about 549.9432856120.

It can be divided in two parts, 1663 and 23537, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 166323537 in words is "one hundred sixty-six million, three hundred twenty-three thousand, five hundred thirty-seven".