2778385601 has 4 divisors (see below), whose sum is σ = 2778840000. Its totient is φ = 2777931204.

The previous prime is 2778385591. The next prime is 2778385609. The reversal of 2778385601 is 1065838772.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2778385601 - 2¹⁸ = 2778123457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2778385609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217901 + ... + 230298.

It is an arithmetic number, because the mean of its divisors is an integer number (694710000).

Almost surely, 2^2778385601 is an apocalyptic number.

It is an amenable number.

2778385601 is a deficient number, since it is larger than the sum of its proper divisors (454399).

2778385601 is an equidigital number, since it uses as much as digits as its factorization.

2778385601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454398.

The product of its (nonzero) digits is 564480, while the sum is 47.

The square root of 2778385601 is about 52710.3936714572. The cubic root of 2778385601 is about 1405.8236329507.

The spelling of 2778385601 in words is "two billion, seven hundred seventy-eight million, three hundred eighty-five thousand, six hundred one".