1666448235 has 20 divisors (see below), whose sum is σ = 2987263488. Its totient is φ = 888772176.

The previous prime is 1666448221. The next prime is 1666448261. The reversal of 1666448235 is 5328446661.

It is not a de Polignac number, because 1666448235 - 2⁷ = 1666448107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2056939 + ... + 2057748.

Almost surely, 2^1666448235 is an apocalyptic number.

1666448235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666448235 is a deficient number, since it is larger than the sum of its proper divisors (1320815253).

1666448235 is an equidigital number, since it uses as much as digits as its factorization.

1666448235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114704 (or 4114695 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 1666448235 is about 40822.1537280923. The cubic root of 1666448235 is about 1185.5793033582.

The spelling of 1666448235 in words is "one billion, six hundred sixty-six million, four hundred forty-eight thousand, two hundred thirty-five".