18156975698644 has 12 divisors (see below), whose sum is σ = 33156216493344. Its totient is φ = 8683770986264.

The previous prime is 18156975698639. The next prime is 18156975698677. The reversal of 18156975698644 is 44689657965181.

It is a super-4 number, since 4×18156975698644⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98679215662 + ... + 98679215845.

It is an arithmetic number, because the mean of its divisors is an integer number (2763018041112).

Almost surely, 2^{18156975698644} is an apocalyptic number.

It is an amenable number.

18156975698644 is a deficient number, since it is larger than the sum of its proper divisors (14999240794700).

18156975698644 is a wasteful number, since it uses less digits than its factorization.

18156975698644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197358431534 (or 197358431532 counting only the distinct ones).

The product of its digits is 3135283200, while the sum is 79.

The spelling of 18156975698644 in words is "eighteen trillion, one hundred fifty-six billion, nine hundred seventy-five million, six hundred ninety-eight thousand, six hundred forty-four".