18377559380 has 18 divisors (see below), whose sum is σ = 38594147886. Its totient is φ = 7350781248.

The previous prime is 18377559371. The next prime is 18377559401. The reversal of 18377559380 is 8395577381.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9378760336 + 8998799044 = 96844^2 + 94862^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 591104 + ... + 621416.

It is an arithmetic number, because the mean of its divisors is an integer number (2144119327).

Almost surely, 2^18377559380 is an apocalyptic number.

18377559380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18377559380 is an abundant number, since it is smaller than the sum of its proper divisors (20216588506).

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

18377559380 is an frugal number, since it uses more digits than its factorization.

18377559380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60635 (or 30320 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 18377559380 in words is "eighteen billion, three hundred seventy-seven million, five hundred fifty-nine thousand, three hundred eighty".