130720665 has 16 divisors (see below), whose sum is σ = 220161600. Its totient is φ = 66048192.

The previous prime is 130720663. The next prime is 130720679. The reversal of 130720665 is 566027031.

It is not a de Polignac number, because 130720665 - 2¹ = 130720663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (130720663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229050 + ... + 229619.

It is an arithmetic number, because the mean of its divisors is an integer number (13760100).

Almost surely, 2^130720665 is an apocalyptic number.

130720665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

130720665 is a deficient number, since it is larger than the sum of its proper divisors (89440935).

130720665 is a wasteful number, since it uses less digits than its factorization.

130720665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458696.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 130720665 is about 11433.3138240844. The cubic root of 130720665 is about 507.5140653078.

Adding to 130720665 its reverse (566027031), we get a palindrome (696747696).

The spelling of 130720665 in words is "one hundred thirty million, seven hundred twenty thousand, six hundred sixty-five".