1665464549 has 16 divisors (see below), whose sum is σ = 1914445440. Its totient is φ = 1419275520.

The previous prime is 1665464533. The next prime is 1665464557. The reversal of 1665464549 is 9454645661.

It is a cyclic number.

It is not a de Polignac number, because 1665464549 - 2⁴ = 1665464533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665464497 and 1665464506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665464149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1140782 + ... + 1142240.

It is an arithmetic number, because the mean of its divisors is an integer number (119652840).

Almost surely, 2^1665464549 is an apocalyptic number.

It is an amenable number.

1665464549 is a deficient number, since it is larger than the sum of its proper divisors (248980891).

1665464549 is a wasteful number, since it uses less digits than its factorization.

1665464549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300.

The product of its digits is 3110400, while the sum is 50.

The square root of 1665464549 is about 40810.1035161637. The cubic root of 1665464549 is about 1185.3459793170.

The spelling of 1665464549 in words is "one billion, six hundred sixty-five million, four hundred sixty-four thousand, five hundred forty-nine".