18540721248 has 48 divisors (see below), whose sum is σ = 55622165760. Its totient is φ = 5297348736.

The previous prime is 18540721247. The next prime is 18540721253. The reversal of 18540721248 is 84212704581.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540721247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13794508 + ... + 13795851.

It is an arithmetic number, because the mean of its divisors is an integer number (1158795120).

Almost surely, 2^18540721248 is an apocalyptic number.

It is an amenable number.

18540721248 is an abundant number, since it is smaller than the sum of its proper divisors (37081444512).

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

18540721248 is a wasteful number, since it uses less digits than its factorization.

18540721248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27590379 (or 27590371 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The spelling of 18540721248 in words is "eighteen billion, five hundred forty million, seven hundred twenty-one thousand, two hundred forty-eight".