2566720798 has 4 divisors (see below), whose sum is σ = 3850081200. Its totient is φ = 1283360398.

The previous prime is 2566720781. The next prime is 2566720799. The reversal of 2566720798 is 8970276652.

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

It is a super-3 number, since 3×2566720798³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566720799) 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 as a sum of consecutive naturals, namely, 641680198 + ... + 641680201.

It is an arithmetic number, because the mean of its divisors is an integer number (962520300).

Almost surely, 2^2566720798 is an apocalyptic number.

2566720798 is a deficient number, since it is larger than the sum of its proper divisors (1283360402).

2566720798 is a wasteful number, since it uses less digits than its factorization.

2566720798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283360401.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The square root of 2566720798 is about 50662.8147461232. The cubic root of 2566720798 is about 1369.1768365620.

The spelling of 2566720798 in words is "two billion, five hundred sixty-six million, seven hundred twenty thousand, seven hundred ninety-eight".