665293776 has 160 divisors (see below), whose sum is σ = 2123078400. Its totient is φ = 178827264.

The previous prime is 665293771. The next prime is 665293813. The reversal of 665293776 is 677392566.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665293771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278700 + ... + 281076.

It is an arithmetic number, because the mean of its divisors is an integer number (13269240).

Almost surely, 2^665293776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665293776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061539200).

665293776 is an abundant number, since it is smaller than the sum of its proper divisors (1457784624).

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

665293776 is a wasteful number, since it uses less digits than its factorization.

665293776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426 (or 2406 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 51.

The square root of 665293776 is about 25793.2893598316. The cubic root of 665293776 is about 872.9803873940.

The spelling of 665293776 in words is "six hundred sixty-five million, two hundred ninety-three thousand, seven hundred seventy-six".