1296166465 has 32 divisors (see below), whose sum is σ = 1726272000. Its totient is φ = 926392320.

The previous prime is 1296166441. The next prime is 1296166471. The reversal of 1296166465 is 5646616921.

It is not a de Polignac number, because 1296166465 - 2⁵ = 1296166433 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1802376 + ... + 1803094.

It is an arithmetic number, because the mean of its divisors is an integer number (53946000).

Almost surely, 2^1296166465 is an apocalyptic number.

It is an amenable number.

1296166465 is a deficient number, since it is larger than the sum of its proper divisors (430105535).

1296166465 is a wasteful number, since it uses less digits than its factorization.

1296166465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257.

The product of its digits is 466560, while the sum is 46.

The square root of 1296166465 is about 36002.3119396519. The cubic root of 1296166465 is about 1090.3190337902.

It can be divided in two parts, 1296 and 166465, that added together give a palindrome (167761).

The spelling of 1296166465 in words is "one billion, two hundred ninety-six million, one hundred sixty-six thousand, four hundred sixty-five".