618626559490 has 16 divisors (see below), whose sum is σ = 1113874866360. Its totient is φ = 247373499520.

The previous prime is 618626559479. The next prime is 618626559493. The reversal of 618626559490 is 94955626816.

It can be written as a sum of positive squares in 4 ways, for example, as 589165240041 + 29461319449 = 767571^2 + 171643^2 .

It is not an unprimeable number, because it can be changed into a prime (618626559493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9606841 + ... + 9671020.

Almost surely, 2^618626559490 is an apocalyptic number.

618626559490 is a deficient number, since it is larger than the sum of its proper divisors (495248306870).

618626559490 is a wasteful number, since it uses less digits than its factorization.

618626559490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19281077.

The product of its (nonzero) digits is 27993600, while the sum is 61.

The spelling of 618626559490 in words is "six hundred eighteen billion, six hundred twenty-six million, five hundred fifty-nine thousand, four hundred ninety".