665749783 has 8 divisors (see below), whose sum is σ = 685937088. Its totient is φ = 645813504.

The previous prime is 665749757. The next prime is 665749793. The reversal of 665749783 is 387947566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665749783 - 2⁵ = 665749751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665749793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57366 + ... + 67987.

It is an arithmetic number, because the mean of its divisors is an integer number (85742136).

Almost surely, 2^665749783 is an apocalyptic number.

665749783 is a deficient number, since it is larger than the sum of its proper divisors (20187305).

665749783 is a wasteful number, since it uses less digits than its factorization.

665749783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125513.

The product of its digits is 7620480, while the sum is 55.

The square root of 665749783 is about 25802.1274898021. The cubic root of 665749783 is about 873.1797951666.

The spelling of 665749783 in words is "six hundred sixty-five million, seven hundred forty-nine thousand, seven hundred eighty-three".