665277081 has 64 divisors (see below), whose sum is σ = 1094860800. Its totient is φ = 351187200.

The previous prime is 665277079. The next prime is 665277113. The reversal of 665277081 is 180772566.

It is not a de Polignac number, because 665277081 - 2¹ = 665277079 is a prime.

It is a super-2 number, since 2×665277081² = 885187189007761122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665277281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2473015 + ... + 2473283.

It is an arithmetic number, because the mean of its divisors is an integer number (17107200).

Almost surely, 2^665277081 is an apocalyptic number.

It is an amenable number.

665277081 is a deficient number, since it is larger than the sum of its proper divisors (429583719).

665277081 is a wasteful number, since it uses less digits than its factorization.

665277081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 665277081 is about 25792.9657271125. The cubic root of 665277081 is about 872.9730850914.

The spelling of 665277081 in words is "six hundred sixty-five million, two hundred seventy-seven thousand, eighty-one".