1666027488 has 48 divisors (see below), whose sum is σ = 4375679616. Its totient is φ = 555043200.

The previous prime is 1666027481. The next prime is 1666027501. The reversal of 1666027488 is 8847206661.

It is a Cunningham number, because it is equal to 40817²-1.

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 (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666027481) 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, 241495 + ... + 248297.

It is an arithmetic number, because the mean of its divisors is an integer number (91159992).

Almost surely, 2^1666027488 is an apocalyptic number.

It is an amenable number.

1666027488 is an abundant number, since it is smaller than the sum of its proper divisors (2709652128).

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

1666027488 is a wasteful number, since it uses less digits than its factorization.

1666027488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9367 (or 9359 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 1666027488 is about 40816.9999877502. Note that the first 4 decimals coincide. The cubic root of 1666027488 is about 1185.4795160957.

The spelling of 1666027488 in words is "one billion, six hundred sixty-six million, twenty-seven thousand, four hundred eighty-eight".