3768478661 has 4 divisors (see below), whose sum is σ = 3768904524. Its totient is φ = 3768052800.

The previous prime is 3768478607. The next prime is 3768478709. The reversal of 3768478661 is 1668748673.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1977580900 + 1790897761 = 44470^2 + 42319^2 .

It is a cyclic number.

It is not a de Polignac number, because 3768478661 - 2²² = 3764284357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3768478597 and 3768478606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3768472661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199370 + ... + 217451.

It is an arithmetic number, because the mean of its divisors is an integer number (942226131).

Almost surely, 2^3768478661 is an apocalyptic number.

It is an amenable number.

3768478661 is a deficient number, since it is larger than the sum of its proper divisors (425863).

3768478661 is an equidigital number, since it uses as much as digits as its factorization.

3768478661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425862.

The product of its digits is 8128512, while the sum is 56.

The square root of 3768478661 is about 61387.9357936069. The cubic root of 3768478661 is about 1556.1639615321.

The spelling of 3768478661 in words is "three billion, seven hundred sixty-eight million, four hundred seventy-eight thousand, six hundred sixty-one".