1011561023465 has 16 divisors (see below), whose sum is σ = 1223804447040. Its totient is φ = 802639419840.

The previous prime is 1011561023453. The next prime is 1011561023509. The reversal of 1011561023465 is 5643201651101.

It is not a de Polignac number, because 1011561023465 - 2²⁰ = 1011559974889 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3179 + ... + 1422368.

It is an arithmetic number, because the mean of its divisors is an integer number (76487777940).

Almost surely, 2^{1011561023465} is an apocalyptic number.

It is an amenable number.

1011561023465 is a deficient number, since it is larger than the sum of its proper divisors (212243423575).

1011561023465 is a wasteful number, since it uses less digits than its factorization.

1011561023465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426712.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 1011561023465 its reverse (5643201651101), we get a palindrome (6654762674566).

The spelling of 1011561023465 in words is "one trillion, eleven billion, five hundred sixty-one million, twenty-three thousand, four hundred sixty-five".