18949771123 has 16 divisors (see below), whose sum is σ = 20231078400. Its totient is φ = 17687376000.

The previous prime is 18949771121. The next prime is 18949771133. The reversal of 18949771123 is 32117794981.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18949771123 - 2¹ = 18949771121 is a prime.

It is a super-2 number, since 2×18949771123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18949771121) 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, 1613928 + ... + 1625626.

It is an arithmetic number, because the mean of its divisors is an integer number (1264442400).

Almost surely, 2^18949771123 is an apocalyptic number.

18949771123 is a deficient number, since it is larger than the sum of its proper divisors (1281307277).

18949771123 is a wasteful number, since it uses less digits than its factorization.

18949771123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12498.

The product of its digits is 762048, while the sum is 52.

The spelling of 18949771123 in words is "eighteen billion, nine hundred forty-nine million, seven hundred seventy-one thousand, one hundred twenty-three".