3778665345 has 192 divisors, whose sum is σ = 8529131520. Its totient is φ = 1504548864.

The previous prime is 3778665323. The next prime is 3778665379. The reversal of 3778665345 is 5435668773.

3778665345 is a `hidden beast` number, since 37 + 78 + 6 + 6 + 534 + 5 = 666.

3778665345 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3778665345 - 2⁶ = 3778665281 is a prime.

Its product of digits (12700800) is a multiple of the sum of its prime factors (784).

It is a junction number, because it is equal to n+sod(n) for n = 3778665291 and 3778665300.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5581147 + ... + 5581823.

It is an arithmetic number, because the mean of its divisors is an integer number (44422560).

Almost surely, 2^3778665345 is an apocalyptic number.

3778665345 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3778665345 is an abundant number, since it is smaller than the sum of its proper divisors (4750466175).

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

3778665345 is a wasteful number, since it uses less digits than its factorization.

3778665345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 781 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 54.

The square root of 3778665345 is about 61470.8495548906. The cubic root of 3778665345 is about 1557.5648706606.

The spelling of 3778665345 in words is "three billion, seven hundred seventy-eight million, six hundred sixty-five thousand, three hundred forty-five".