919218706477 has 2 divisors, whose sum is σ = 919218706478. Its totient is φ = 919218706476.

The previous prime is 919218706459. The next prime is 919218706541. The reversal of 919218706477 is 774607812919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500802490276 + 418416216201 = 707674^2 + 646851^2 .

It is a cyclic number.

It is not a de Polignac number, because 919218706477 - 2⁷ = 919218706349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919218706577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459609353238 + 459609353239.

It is an arithmetic number, because the mean of its divisors is an integer number (459609353239).

Almost surely, 2^919218706477 is an apocalyptic number.

It is an amenable number.

919218706477 is a deficient number, since it is larger than the sum of its proper divisors (1).

919218706477 is an equidigital number, since it uses as much as digits as its factorization.

919218706477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10668672, while the sum is 61.

The spelling of 919218706477 in words is "nine hundred nineteen billion, two hundred eighteen million, seven hundred six thousand, four hundred seventy-seven".