1221266045465 has 32 divisors (see below), whose sum is σ = 1557226653696. Its totient is φ = 916284948480.

The previous prime is 1221266045459. The next prime is 1221266045471. The reversal of 1221266045465 is 5645406621221.

It is an interprime number because it is at equal distance from previous prime (1221266045459) and next prime (1221266045471).

It is not a de Polignac number, because 1221266045465 - 2⁴ = 1221266045449 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 31 ways as a sum of consecutive naturals, for example, 59438984 + ... + 59459526.

It is an arithmetic number, because the mean of its divisors is an integer number (48663332928).

Almost surely, 2^{1221266045465} is an apocalyptic number.

It is an amenable number.

1221266045465 is a deficient number, since it is larger than the sum of its proper divisors (335960608231).

1221266045465 is a wasteful number, since it uses less digits than its factorization.

1221266045465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23009.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 1221266045465 in words is "one trillion, two hundred twenty-one billion, two hundred sixty-six million, forty-five thousand, four hundred sixty-five".