618644649487 has 2 divisors, whose sum is σ = 618644649488. Its totient is φ = 618644649486.

The previous prime is 618644649481. The next prime is 618644649569. The reversal of 618644649487 is 784946446816.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618644649487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618644649481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309322324743 + 309322324744.

It is an arithmetic number, because the mean of its divisors is an integer number (309322324744).

Almost surely, 2^618644649487 is an apocalyptic number.

618644649487 is a deficient number, since it is larger than the sum of its proper divisors (1).

618644649487 is an equidigital number, since it uses as much as digits as its factorization.

618644649487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222953472, while the sum is 67.

The spelling of 618644649487 in words is "six hundred eighteen billion, six hundred forty-four million, six hundred forty-nine thousand, four hundred eighty-seven".