1661788976 has 20 divisors (see below), whose sum is σ = 3323578944. Its totient is φ = 804091200.

The previous prime is 1661788927. The next prime is 1661788991. The reversal of 1661788976 is 6798871661.

1661788976 is an admirable number.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1674695 + ... + 1675686.

Almost surely, 2^1661788976 is an apocalyptic number.

1661788976 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1661788976 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1661788976 is a wasteful number, since it uses less digits than its factorization.

1661788976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3350420 (or 3350414 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 59.

The square root of 1661788976 is about 40765.0460075786. The cubic root of 1661788976 is about 1184.4733429719.

The spelling of 1661788976 in words is "one billion, six hundred sixty-one million, seven hundred eighty-eight thousand, nine hundred seventy-six".