18938373463 has 4 divisors (see below), whose sum is σ = 19549288768. Its totient is φ = 18327458160.

The previous prime is 18938373431. The next prime is 18938373533. The reversal of 18938373463 is 36437383981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36437383981 = 283 ⋅128754007.

It is a cyclic number.

It is not a de Polignac number, because 18938373463 - 2⁵ = 18938373431 is a prime.

It is a super-2 number, since 2×18938373463² (a number of 21 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 (18938373403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305457606 + ... + 305457667.

It is an arithmetic number, because the mean of its divisors is an integer number (4887322192).

Almost surely, 2^18938373463 is an apocalyptic number.

18938373463 is a deficient number, since it is larger than the sum of its proper divisors (610915305).

18938373463 is an equidigital number, since it uses as much as digits as its factorization.

18938373463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610915304.

The product of its digits is 7838208, while the sum is 55.

The spelling of 18938373463 in words is "eighteen billion, nine hundred thirty-eight million, three hundred seventy-three thousand, four hundred sixty-three".