18347520378 has 32 divisors (see below), whose sum is σ = 40882682880. Its totient is φ = 5441558960.

The previous prime is 18347520361. The next prime is 18347520383. The reversal of 18347520378 is 87302574381.

It is a super-2 number, since 2×18347520378² (a number of 21 digits) contains 22 as substring.

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, 2954268 + ... + 2960471.

It is an arithmetic number, because the mean of its divisors is an integer number (1277583840).

Almost surely, 2^18347520378 is an apocalyptic number.

18347520378 is an abundant number, since it is smaller than the sum of its proper divisors (22535162502).

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

18347520378 is a wasteful number, since it uses less digits than its factorization.

18347520378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5914802.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 18347520378 in words is "eighteen billion, three hundred forty-seven million, five hundred twenty thousand, three hundred seventy-eight".