18196289478 has 24 divisors (see below), whose sum is σ = 39427947000. Its totient is φ = 6065021664.

The previous prime is 18196289467. The next prime is 18196289519. The reversal of 18196289478 is 87498269181.

18196289478 is a `hidden beast` number, since 1 + 81 + 9 + 6 + 2 + 89 + 478 = 666.

It is a super-2 number, since 2×18196289478² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371673 + ... + 417771.

It is an arithmetic number, because the mean of its divisors is an integer number (1642831125).

Almost surely, 2^18196289478 is an apocalyptic number.

18196289478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18196289478 is an abundant number, since it is smaller than the sum of its proper divisors (21231657522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18196289478 is a wasteful number, since it uses less digits than its factorization.

18196289478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68036 (or 68033 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 63.

The spelling of 18196289478 in words is "eighteen billion, one hundred ninety-six million, two hundred eighty-nine thousand, four hundred seventy-eight".