4002778601 has 2 divisors, whose sum is σ = 4002778602. Its totient is φ = 4002778600.

The previous prime is 4002778597. The next prime is 4002778607. The reversal of 4002778601 is 1068772004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3431616400 + 571162201 = 58580^2 + 23899^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002778601 - 2² = 4002778597 is a prime.

It is not a weakly prime, because it can be changed into another prime (4002778607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001389300 + 2001389301.

It is an arithmetic number, because the mean of its divisors is an integer number (2001389301).

Almost surely, 2^4002778601 is an apocalyptic number.

It is an amenable number.

4002778601 is a deficient number, since it is larger than the sum of its proper divisors (1).

4002778601 is an equidigital number, since it uses as much as digits as its factorization.

4002778601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 4002778601 is about 63267.5161595585. The cubic root of 4002778601 is about 1587.7685297377.

The spelling of 4002778601 in words is "four billion, two million, seven hundred seventy-eight thousand, six hundred one".