1264661465 has 8 divisors (see below), whose sum is σ = 1517856648. Its totient is φ = 1011553920.

The previous prime is 1264661393. The next prime is 1264661479. The reversal of 1264661465 is 5641664621.

It can be written as a sum of positive squares in 4 ways, for example, as 104305369 + 1160356096 = 10213^2 + 34064^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1264661465 - 2¹⁸ = 1264399321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15719 + ... + 52691.

It is an arithmetic number, because the mean of its divisors is an integer number (189732081).

Almost surely, 2^1264661465 is an apocalyptic number.

It is an amenable number.

1264661465 is a deficient number, since it is larger than the sum of its proper divisors (253195183).

1264661465 is an equidigital number, since it uses as much as digits as its factorization.

1264661465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43819.

The product of its digits is 207360, while the sum is 41.

The square root of 1264661465 is about 35562.0790309003. The cubic root of 1264661465 is about 1081.4126077072.

The spelling of 1264661465 in words is "one billion, two hundred sixty-four million, six hundred sixty-one thousand, four hundred sixty-five".