665769456 has 140 divisors (see below), whose sum is σ = 2110233240. Its totient is φ = 201709440.

The previous prime is 665769451. The next prime is 665769463. The reversal of 665769456 is 654967566.

665769456 is a `hidden beast` number, since 66 + 576 + 9 + 4 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665769451) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 125710 + ... + 130898.

Almost surely, 2^665769456 is an apocalyptic number.

665769456 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665769456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055116620).

665769456 is an abundant number, since it is smaller than the sum of its proper divisors (1444463784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665769456 is a wasteful number, since it uses less digits than its factorization.

665769456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5226 (or 5205 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The square root of 665769456 is about 25802.5087152393. The cubic root of 665769456 is about 873.1883959439.

The spelling of 665769456 in words is "six hundred sixty-five million, seven hundred sixty-nine thousand, four hundred fifty-six".