1666057616 has 10 divisors (see below), whose sum is σ = 3227986662. Its totient is φ = 833028800.

The previous prime is 1666057573. The next prime is 1666057633. The reversal of 1666057616 is 6167506661.

It can be written as a sum of positive squares in only one way, i.e., 1245807616 + 420250000 = 35296^2 + 20500^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52064285 + ... + 52064316.

Almost surely, 2^1666057616 is an apocalyptic number.

1666057616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666057616 is a deficient number, since it is larger than the sum of its proper divisors (1561929046).

1666057616 is a wasteful number, since it uses less digits than its factorization.

1666057616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104128609 (or 104128603 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 1666057616 is about 40817.3690479923. The cubic root of 1666057616 is about 1185.4866620185.

The spelling of 1666057616 in words is "one billion, six hundred sixty-six million, fifty-seven thousand, six hundred sixteen".