1211511004465 has 32 divisors (see below), whose sum is σ = 1481877964800. Its totient is φ = 950676592320.

The previous prime is 1211511004453. The next prime is 1211511004481. The reversal of 1211511004465 is 5644001151121.

It is not a de Polignac number, because 1211511004465 - 2⁹ = 1211511003953 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, 46910326 + ... + 46936144.

It is an arithmetic number, because the mean of its divisors is an integer number (46308686400).

Almost surely, 2^{1211511004465} is an apocalyptic number.

It is an amenable number.

1211511004465 is a deficient number, since it is larger than the sum of its proper divisors (270366960335).

1211511004465 is a wasteful number, since it uses less digits than its factorization.

1211511004465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26677.

The product of its (nonzero) digits is 4800, while the sum is 31.

Adding to 1211511004465 its reverse (5644001151121), we get a palindrome (6855512155586).

The spelling of 1211511004465 in words is "one trillion, two hundred eleven billion, five hundred eleven million, four thousand, four hundred sixty-five".