1664270265 has 32 divisors (see below), whose sum is σ = 3044966400. Its totient is φ = 760377024.

The previous prime is 1664270263. The next prime is 1664270281. The reversal of 1664270265 is 5620724661.

It is not a de Polignac number, because 1664270265 - 2¹ = 1664270263 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1664270263) 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 31 ways as a sum of consecutive naturals, for example, 248592 + ... + 255198.

It is an arithmetic number, because the mean of its divisors is an integer number (95155200).

Almost surely, 2^1664270265 is an apocalyptic number.

1664270265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1664270265 is a deficient number, since it is larger than the sum of its proper divisors (1380696135).

1664270265 is a wasteful number, since it uses less digits than its factorization.

1664270265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9021.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 1664270265 is about 40795.4686821956. The cubic root of 1664270265 is about 1185.0625792585.

The spelling of 1664270265 in words is "one billion, six hundred sixty-four million, two hundred seventy thousand, two hundred sixty-five".