18966601440 has 96 divisors (see below), whose sum is σ = 66383120160. Its totient is φ = 5057759232.

The previous prime is 18966601411. The next prime is 18966601447. The reversal of 18966601440 is 4410666981.

It is a tau number, because it is divible by the number of its divisors (96).

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 (18966601447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2190889 + ... + 2199528.

It is an arithmetic number, because the mean of its divisors is an integer number (691490835).

Almost surely, 2^18966601440 is an apocalyptic number.

18966601440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18966601440 is an abundant number, since it is smaller than the sum of its proper divisors (47416518720).

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

18966601440 is a wasteful number, since it uses less digits than its factorization.

18966601440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4390441 (or 4390427 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 18966601440 in words is "eighteen billion, nine hundred sixty-six million, six hundred one thousand, four hundred forty".