18487707778 has 8 divisors (see below), whose sum is σ = 27732253068. Its totient is φ = 9243623424.

The previous prime is 18487707773. The next prime is 18487707787. The reversal of 18487707778 is 87770778481.

It can be written as a sum of positive squares in 2 ways, for example, as 17722798129 + 764909649 = 133127^2 + 27657^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18487707773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14050 + ... + 192802.

Almost surely, 2^18487707778 is an apocalyptic number.

18487707778 is a deficient number, since it is larger than the sum of its proper divisors (9244545290).

18487707778 is a wasteful number, since it uses less digits than its factorization.

18487707778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230468.

The product of its (nonzero) digits is 34420736, while the sum is 64.

The spelling of 18487707778 in words is "eighteen billion, four hundred eighty-seven million, seven hundred seven thousand, seven hundred seventy-eight".