1660644416 has 14 divisors (see below), whose sum is σ = 3295341390. Its totient is φ = 830322176.

The previous prime is 1660644407. The next prime is 1660644449. The reversal of 1660644416 is 6144460661.

It can be written as a sum of positive squares in only one way, i.e., 1640574016 + 20070400 = 40504^2 + 4480^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1660644416.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12973721 + ... + 12973848.

Almost surely, 2^1660644416 is an apocalyptic number.

1660644416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1660644416 is a deficient number, since it is larger than the sum of its proper divisors (1634696974).

1660644416 is an equidigital number, since it uses as much as digits as its factorization.

1660644416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25947581 (or 25947571 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 1660644416 is about 40751.0050918993. The cubic root of 1660644416 is about 1184.2013445021.

The spelling of 1660644416 in words is "one billion, six hundred sixty million, six hundred forty-four thousand, four hundred sixteen".