18181797980 has 24 divisors (see below), whose sum is σ = 38184311088. Its totient is φ = 7272236288.

The previous prime is 18181797961. The next prime is 18181797989. The reversal of 18181797980 is 8979718181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18181797989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560567 + ... + 592113.

It is an arithmetic number, because the mean of its divisors is an integer number (1591012962).

Almost surely, 2^18181797980 is an apocalyptic number.

18181797980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18181797980 is an abundant number, since it is smaller than the sum of its proper divisors (20002513108).

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

18181797980 is a wasteful number, since it uses less digits than its factorization.

18181797980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60373 (or 60371 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 59.

The spelling of 18181797980 in words is "eighteen billion, one hundred eighty-one million, seven hundred ninety-seven thousand, nine hundred eighty".