18534777680 has 40 divisors (see below), whose sum is σ = 45628264872. Its totient is φ = 6977798144.

The previous prime is 18534777671. The next prime is 18534777707. The reversal of 18534777680 is 8677743581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3600960064 + 14933817616 = 60008^2 + 122204^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-4 number, since 4×18534777680⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6812897 + ... + 6815616.

Almost surely, 2^18534777680 is an apocalyptic number.

18534777680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18534777680 is an abundant number, since it is smaller than the sum of its proper divisors (27093487192).

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

18534777680 is a wasteful number, since it uses less digits than its factorization.

18534777680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13628543 (or 13628537 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 56.

The spelling of 18534777680 in words is "eighteen billion, five hundred thirty-four million, seven hundred seventy-seven thousand, six hundred eighty".