166698609636 has 192 divisors, whose sum is σ = 441737424128. Its totient is φ = 48575987712.

The previous prime is 166698609631. The next prime is 166698609641. The reversal of 166698609636 is 636906896661.

It is an interprime number because it is at equal distance from previous prime (166698609631) and next prime (166698609641).

It is not an unprimeable number, because it can be changed into a prime (166698609631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 83641056 + ... + 83643048.

Almost surely, 2^166698609636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166698609636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220868712064).

166698609636 is an abundant number, since it is smaller than the sum of its proper divisors (275038814492).

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

166698609636 is a wasteful number, since it uses less digits than its factorization.

166698609636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430 (or 2428 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 66.

The spelling of 166698609636 in words is "one hundred sixty-six billion, six hundred ninety-eight million, six hundred nine thousand, six hundred thirty-six".