1665763393 has 32 divisors (see below), whose sum is σ = 2043740160. Its totient is φ = 1326991680.

The previous prime is 1665763387. The next prime is 1665763433. The reversal of 1665763393 is 3933675661.

It is a happy number.

It is not a de Polignac number, because 1665763393 - 2⁵ = 1665763361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665763373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1402746 + ... + 1403932.

It is an arithmetic number, because the mean of its divisors is an integer number (63866880).

Almost surely, 2^1665763393 is an apocalyptic number.

It is an amenable number.

1665763393 is a deficient number, since it is larger than the sum of its proper divisors (377976767).

1665763393 is a wasteful number, since it uses less digits than its factorization.

1665763393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477.

The product of its digits is 1837080, while the sum is 49.

The square root of 1665763393 is about 40813.7647491628. The cubic root of 1665763393 is about 1185.4168729201.

The spelling of 1665763393 in words is "one billion, six hundred sixty-five million, seven hundred sixty-three thousand, three hundred ninety-three".