166777380 has 360 divisors, whose sum is σ = 667408896. Its totient is φ = 34473600.

The previous prime is 166777357. The next prime is 166777397. The reversal of 166777380 is 83777661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 873085 + ... + 873275.

Almost surely, 2^166777380 is an apocalyptic number.

166777380 is a gapful number since it is divisible by the number (10) 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 166777380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333704448).

166777380 is an abundant number, since it is smaller than the sum of its proper divisors (500631516).

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

166777380 is a wasteful number, since it uses less digits than its factorization.

166777380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 166777380 is about 12914.2316844635. The cubic root of 166777380 is about 550.4430369677.

The spelling of 166777380 in words is "one hundred sixty-six million, seven hundred seventy-seven thousand, three hundred eighty".