660265631 has 4 divisors (see below), whose sum is σ = 663395064. Its totient is φ = 657136200.

The previous prime is 660265607. The next prime is 660265633. The reversal of 660265631 is 136562066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660265631 - 2¹⁰ = 660264607 is a prime.

It is a super-2 number, since 2×660265631² = 871901406959656322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660265591 and 660265600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660265633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1564400 + ... + 1564821.

It is an arithmetic number, because the mean of its divisors is an integer number (165848766).

Almost surely, 2^660265631 is an apocalyptic number.

660265631 is a deficient number, since it is larger than the sum of its proper divisors (3129433).

660265631 is a wasteful number, since it uses less digits than its factorization.

660265631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3129432.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 660265631 is about 25695.6344735833. The cubic root of 660265631 is about 870.7755584807.

The spelling of 660265631 in words is "six hundred sixty million, two hundred sixty-five thousand, six hundred thirty-one".