1618322768638 has 16 divisors (see below), whose sum is σ = 2547177943680. Its totient is φ = 769656537496.

The previous prime is 1618322768611. The next prime is 1618322768641. The reversal of 1618322768638 is 8368672238161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98262520 + ... + 98278987.

It is an arithmetic number, because the mean of its divisors is an integer number (159198621480).

Almost surely, 2^{1618322768638} is an apocalyptic number.

1618322768638 is a deficient number, since it is larger than the sum of its proper divisors (928855175042).

1618322768638 is a wasteful number, since it uses less digits than its factorization.

1618322768638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196541711.

The product of its digits is 27869184, while the sum is 61.

The spelling of 1618322768638 in words is "one trillion, six hundred eighteen billion, three hundred twenty-two million, seven hundred sixty-eight thousand, six hundred thirty-eight".