1081665448 has 8 divisors (see below), whose sum is σ = 2028122730. Its totient is φ = 540832720.

The previous prime is 1081665433. The next prime is 1081665449. The reversal of 1081665448 is 8445661801.

It can be written as a sum of positive squares in only one way, i.e., 648109764 + 433555684 = 25458^2 + 20822^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1081665449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67604083 + ... + 67604098.

Almost surely, 2^1081665448 is an apocalyptic number.

It is an amenable number.

1081665448 is a deficient number, since it is larger than the sum of its proper divisors (946457282).

1081665448 is a wasteful number, since it uses less digits than its factorization.

1081665448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135208187 (or 135208183 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 1081665448 is about 32888.6826735277. The cubic root of 1081665448 is about 1026.5126815963.

The spelling of 1081665448 in words is "one billion, eighty-one million, six hundred sixty-five thousand, four hundred forty-eight".