18939227954199 has 16 divisors (see below), whose sum is σ = 28886772948480. Its totient is φ = 10812292092000.

The previous prime is 18939227954197. The next prime is 18939227954221. The reversal of 18939227954199 is 99145972293981.

It is not a de Polignac number, because 18939227954199 - 2¹ = 18939227954197 is a prime.

It is a super-2 number, since 2×18939227954199² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939227954197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421805427 + ... + 421850324.

It is an arithmetic number, because the mean of its divisors is an integer number (1805423309280).

Almost surely, 2^{18939227954199} is an apocalyptic number.

18939227954199 is a deficient number, since it is larger than the sum of its proper divisors (9947544994281).

18939227954199 is a wasteful number, since it uses less digits than its factorization.

18939227954199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843656830.

The product of its digits is 793618560, while the sum is 78.

The spelling of 18939227954199 in words is "eighteen trillion, nine hundred thirty-nine billion, two hundred twenty-seven million, nine hundred fifty-four thousand, one hundred ninety-nine".