2625918781 has 2 divisors, whose sum is σ = 2625918782. Its totient is φ = 2625918780.

The previous prime is 2625918751. The next prime is 2625918857. The reversal of 2625918781 is 1878195262.

It is a happy number.

2625918781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2620928025 + 4990756 = 51195^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 2625918781 - 2⁷ = 2625918653 is a prime.

It is a super-2 number, since 2×2625918781² = 13790898888817051922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2625918751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312959390 + 1312959391.

It is an arithmetic number, because the mean of its divisors is an integer number (1312959391).

Almost surely, 2^2625918781 is an apocalyptic number.

It is an amenable number.

2625918781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2625918781 is an equidigital number, since it uses as much as digits as its factorization.

2625918781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The square root of 2625918781 is about 51243.7194297994. The cubic root of 2625918781 is about 1379.6230120908.

The spelling of 2625918781 in words is "two billion, six hundred twenty-five million, nine hundred eighteen thousand, seven hundred eighty-one".