1666253376 has 56 divisors (see below), whose sum is σ = 4898481440. Its totient is φ = 555417216.

The previous prime is 1666253363. The next prime is 1666253411. The reversal of 1666253376 is 6733526661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480406 + ... + 483861.

Almost surely, 2^1666253376 is an apocalyptic number.

1666253376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666253376 is an abundant number, since it is smaller than the sum of its proper divisors (3232228064).

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

1666253376 is an equidigital number, since it uses as much as digits as its factorization.

1666253376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964288 (or 964272 counting only the distinct ones).

The product of its digits is 816480, while the sum is 45.

The square root of 1666253376 is about 40819.7669763070. The cubic root of 1666253376 is about 1185.5330913412.

The spelling of 1666253376 in words is "one billion, six hundred sixty-six million, two hundred fifty-three thousand, three hundred seventy-six".