1988660067 has 4 divisors (see below), whose sum is σ = 2651546760. Its totient is φ = 1325773376.

The previous prime is 1988660039. The next prime is 1988660071. The reversal of 1988660067 is 7600668891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1988660067 - 2¹¹ = 1988658019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988660027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331443342 + ... + 331443347.

It is an arithmetic number, because the mean of its divisors is an integer number (662886690).

Almost surely, 2^1988660067 is an apocalyptic number.

1988660067 is a deficient number, since it is larger than the sum of its proper divisors (662886693).

1988660067 is an equidigital number, since it uses as much as digits as its factorization.

1988660067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662886692.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 1988660067 is about 44594.3950177598. The cubic root of 1988660067 is about 1257.5352984386.

The spelling of 1988660067 in words is "one billion, nine hundred eighty-eight million, six hundred sixty thousand, sixty-seven".