166921305936 has 480 divisors, whose sum is σ = 572807909376. Its totient is φ = 41368320000.

The previous prime is 166921305923. The next prime is 166921305953. The reversal of 166921305936 is 639503129661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 58546911 + ... + 58549761.

Almost surely, 2^166921305936 is an apocalyptic number.

166921305936 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 166921305936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286403954688).

166921305936 is an abundant number, since it is smaller than the sum of its proper divisors (405886603440).

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

166921305936 is a wasteful number, since it uses less digits than its factorization.

166921305936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2991 (or 2978 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 51.

The spelling of 166921305936 in words is "one hundred sixty-six billion, nine hundred twenty-one million, three hundred five thousand, nine hundred thirty-six".