166064778 has 24 divisors (see below), whose sum is σ = 392517216. Its totient is φ = 50322600.

The previous prime is 166064777. The next prime is 166064779. The reversal of 166064778 is 877460661.

It is an interprime number because it is at equal distance from previous prime (166064777) and next prime (166064779).

It is not an unprimeable number, because it can be changed into a prime (166064777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419158 + ... + 419553.

It is an arithmetic number, because the mean of its divisors is an integer number (16354884).

Almost surely, 2^166064778 is an apocalyptic number.

166064778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166064778 is an abundant number, since it is smaller than the sum of its proper divisors (226452438).

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

166064778 is a wasteful number, since it uses less digits than its factorization.

166064778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838730 (or 838727 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 166064778 is about 12886.6123554641. The cubic root of 166064778 is about 549.6579448895.

The spelling of 166064778 in words is "one hundred sixty-six million, sixty-four thousand, seven hundred seventy-eight".