18778063864 has 32 divisors (see below), whose sum is σ = 42605693280. Its totient is φ = 7574344704.

The previous prime is 18778063861. The next prime is 18778063867. The reversal of 18778063864 is 46836087781.

It is an interprime number because it is at equal distance from previous prime (18778063861) and next prime (18778063867).

It is a super-2 number, since 2×18778063864² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18778063799 and 18778063808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18778063861) 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, 9861477 + ... + 9863380.

It is an arithmetic number, because the mean of its divisors is an integer number (1331427915).

Almost surely, 2^18778063864 is an apocalyptic number.

18778063864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18778063864 is an abundant number, since it is smaller than the sum of its proper divisors (23827629416).

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

18778063864 is a wasteful number, since it uses less digits than its factorization.

18778063864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19724887 (or 19724883 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 58.

The spelling of 18778063864 in words is "eighteen billion, seven hundred seventy-eight million, sixty-three thousand, eight hundred sixty-four".