18148717440 has 448 divisors, whose sum is σ = 74356702560. Its totient is φ = 4147531776.

The previous prime is 18148717439. The next prime is 18148717441. The reversal of 18148717440 is 4471784181.

It is an interprime number because it is at equal distance from previous prime (18148717439) and next prime (18148717441).

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18148717441) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3263142 + ... + 3268698.

Almost surely, 2^18148717440 is an apocalyptic number.

18148717440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18148717440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37178351280).

18148717440 is an abundant number, since it is smaller than the sum of its proper divisors (56207985120).

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

18148717440 is an frugal number, since it uses more digits than its factorization.

18148717440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5601 (or 5574 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The spelling of 18148717440 in words is "eighteen billion, one hundred forty-eight million, seven hundred seventeen thousand, four hundred forty".