166999536 has 160 divisors (see below), whose sum is σ = 529251840. Its totient is φ = 49996800.

The previous prime is 166999529. The next prime is 166999543. The reversal of 166999536 is 635999661.

It is a happy number.

166999536 is a `hidden beast` number, since 16 + 6 + 9 + 99 + 536 = 666.

It is an interprime number because it is at equal distance from previous prime (166999529) and next prime (166999543).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 536821 + ... + 537131.

It is an arithmetic number, because the mean of its divisors is an integer number (3307824).

Almost surely, 2^166999536 is an apocalyptic number.

166999536 is a gapful number since it is divisible by the number (16) 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 166999536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264625920).

166999536 is an abundant number, since it is smaller than the sum of its proper divisors (362252304).

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

166999536 is a wasteful number, since it uses less digits than its factorization.

166999536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 440 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 54.

The square root of 166999536 is about 12922.8300306086. The cubic root of 166999536 is about 550.6873346200.

The spelling of 166999536 in words is "one hundred sixty-six million, nine hundred ninety-nine thousand, five hundred thirty-six".