166990464 has 128 divisors (see below), whose sum is σ = 497352000. Its totient is φ = 55157760.

The previous prime is 166990451. The next prime is 166990469. The reversal of 166990464 is 464099661.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (166990469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 729102 + ... + 729330.

Almost surely, 2^166990464 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 166990464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248676000).

166990464 is an abundant number, since it is smaller than the sum of its proper divisors (330361536).

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

166990464 is a wasteful number, since it uses less digits than its factorization.

166990464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 166990464 is about 12922.4790191356. The cubic root of 166990464 is about 550.6773626842.

The spelling of 166990464 in words is "one hundred sixty-six million, nine hundred ninety thousand, four hundred sixty-four".