7218158477 has 2 divisors, whose sum is σ = 7218158478. Its totient is φ = 7218158476.

The previous prime is 7218158461. The next prime is 7218158483. The reversal of 7218158477 is 7748518127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4140793801 + 3077364676 = 64349^2 + 55474^2 .

It is a cyclic number.

It is not a de Polignac number, because 7218158477 - 2⁴ = 7218158461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7218154477) 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, 3609079238 + 3609079239.

It is an arithmetic number, because the mean of its divisors is an integer number (3609079239).

Almost surely, 2^7218158477 is an apocalyptic number.

It is an amenable number.

7218158477 is a deficient number, since it is larger than the sum of its proper divisors (1).

7218158477 is an equidigital number, since it uses as much as digits as its factorization.

7218158477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 878080, while the sum is 50.

The square root of 7218158477 is about 84959.7462154872. The cubic root of 7218158477 is about 1932.6007228153.

The spelling of 7218158477 in words is "seven billion, two hundred eighteen million, one hundred fifty-eight thousand, four hundred seventy-seven".