18945951895393 has 8 divisors (see below), whose sum is σ = 19394843925600. Its totient is φ = 18497436615168.

The previous prime is 18945951895379. The next prime is 18945951895463. The reversal of 18945951895393 is 39359815954981.

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 a de Polignac number, because none of the positive numbers 2^k-18945951895393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18945951895093) 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, 94085728 + ... + 94286881.

It is an arithmetic number, because the mean of its divisors is an integer number (2424355490700).

Almost surely, 2^{18945951895393} is an apocalyptic number.

It is an amenable number.

18945951895393 is a deficient number, since it is larger than the sum of its proper divisors (448892030207).

18945951895393 is a wasteful number, since it uses less digits than its factorization.

18945951895393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188374991.

The product of its digits is 1889568000, while the sum is 79.

The spelling of 18945951895393 in words is "eighteen trillion, nine hundred forty-five billion, nine hundred fifty-one million, eight hundred ninety-five thousand, three hundred ninety-three".