18157967373781 has 8 divisors (see below), whose sum is σ = 18247192185600. Its totient is φ = 18068903474160.

The previous prime is 18157967373757. The next prime is 18157967373787. The reversal of 18157967373781 is 18737376975181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18157967373781 - 2³¹ = 18155819890133 is a prime.

It is a super-2 number, since 2×18157967373781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18157967373787) 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, 40001805 + ... + 40453186.

It is an arithmetic number, because the mean of its divisors is an integer number (2280899023200).

Almost surely, 2^{18157967373781} is an apocalyptic number.

It is an amenable number.

18157967373781 is a deficient number, since it is larger than the sum of its proper divisors (89224811819).

18157967373781 is an equidigital number, since it uses as much as digits as its factorization.

18157967373781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80456099.

The product of its digits is 373403520, while the sum is 73.

The spelling of 18157967373781 in words is "eighteen trillion, one hundred fifty-seven billion, nine hundred sixty-seven million, three hundred seventy-three thousand, seven hundred eighty-one".