2518655221 has 2 divisors, whose sum is σ = 2518655222. Its totient is φ = 2518655220.

The previous prime is 2518655203. The next prime is 2518655267. The reversal of 2518655221 is 1225568152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2072980900 + 445674321 = 45530^2 + 21111^2 .

It is a cyclic number.

It is not a de Polignac number, because 2518655221 - 2²⁵ = 2485100789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2518656221) 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, 1259327610 + 1259327611.

It is an arithmetic number, because the mean of its divisors is an integer number (1259327611).

Almost surely, 2^2518655221 is an apocalyptic number.

It is an amenable number.

2518655221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2518655221 is an equidigital number, since it uses as much as digits as its factorization.

2518655221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48000, while the sum is 37.

The square root of 2518655221 is about 50186.2054851729. The cubic root of 2518655221 is about 1360.5763166223.

The spelling of 2518655221 in words is "two billion, five hundred eighteen million, six hundred fifty-five thousand, two hundred twenty-one".