181216749930 has 32 divisors (see below), whose sum is σ = 445528012608. Its totient is φ = 47145820800.

The previous prime is 181216749919. The next prime is 181216749953. The reversal of 181216749930 is 39947612181.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 73664116 + ... + 73666575.

It is an arithmetic number, because the mean of its divisors is an integer number (13922750394).

Almost surely, 2^181216749930 is an apocalyptic number.

181216749930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181216749930 is an abundant number, since it is smaller than the sum of its proper divisors (264311262678).

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

181216749930 is a wasteful number, since it uses less digits than its factorization.

181216749930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147330742.

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 181216749930 in words is "one hundred eighty-one billion, two hundred sixteen million, seven hundred forty-nine thousand, nine hundred thirty".