3765578166 has 128 divisors (see below), whose sum is σ = 10333440000. Its totient is φ = 1012507776.

The previous prime is 3765578161. The next prime is 3765578191. The reversal of 3765578166 is 6618755673.

3765578166 is a `hidden beast` number, since 3 + 7 + 6 + 5 + 578 + 1 + 66 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3765578161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 308895 + ... + 320853.

It is an arithmetic number, because the mean of its divisors is an integer number (80730000).

Almost surely, 2^3765578166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3765578166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5166720000).

3765578166 is an abundant number, since it is smaller than the sum of its proper divisors (6567861834).

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

3765578166 is a wasteful number, since it uses less digits than its factorization.

3765578166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12008 (or 11988 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The square root of 3765578166 is about 61364.3069381542. The cubic root of 3765578166 is about 1555.7646134396.

The spelling of 3765578166 in words is "three billion, seven hundred sixty-five million, five hundred seventy-eight thousand, one hundred sixty-six".