1215665465 has 16 divisors (see below), whose sum is σ = 1720980480. Its totient is φ = 806708160.

The previous prime is 1215665449. The next prime is 1215665489. The reversal of 1215665465 is 5645665121.

It is not a de Polignac number, because 1215665465 - 2⁴ = 1215665449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559130 + ... + 561299.

It is an arithmetic number, because the mean of its divisors is an integer number (107561280).

Almost surely, 2^1215665465 is an apocalyptic number.

It is an amenable number.

1215665465 is a deficient number, since it is larger than the sum of its proper divisors (505315015).

1215665465 is a wasteful number, since it uses less digits than its factorization.

1215665465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120472.

The product of its digits is 216000, while the sum is 41.

The square root of 1215665465 is about 34866.3944938389. The cubic root of 1215665465 is about 1067.2627696182.

The spelling of 1215665465 in words is "one billion, two hundred fifteen million, six hundred sixty-five thousand, four hundred sixty-five".