618126638 has 4 divisors (see below), whose sum is σ = 927189960. Its totient is φ = 309063318.

The previous prime is 618126637. The next prime is 618126643. The reversal of 618126638 is 836621816.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 618126595 and 618126604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618126637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154531658 + ... + 154531661.

It is an arithmetic number, because the mean of its divisors is an integer number (231797490).

Almost surely, 2^618126638 is an apocalyptic number.

618126638 is a deficient number, since it is larger than the sum of its proper divisors (309063322).

618126638 is a wasteful number, since it uses less digits than its factorization.

618126638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309063321.

The product of its digits is 82944, while the sum is 41.

The square root of 618126638 is about 24862.1527225621. The cubic root of 618126638 is about 851.8422042772.

The spelling of 618126638 in words is "six hundred eighteen million, one hundred twenty-six thousand, six hundred thirty-eight".