11565553021401 has 8 divisors (see below), whose sum is σ = 15429299688544. Its totient is φ = 7706087517600.

The previous prime is 11565553021381. The next prime is 11565553021403. The reversal of 11565553021401 is 10412035556511.

11565553021401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11565553021401 - 2³⁵ = 11531193283033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11565553021401.

It is not an unprimeable number, because it can be changed into a prime (11565553021403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1070284531 + ... + 1070295336.

It is an arithmetic number, because the mean of its divisors is an integer number (1928662461068).

Almost surely, 2^{11565553021401} is an apocalyptic number.

It is an amenable number.

11565553021401 is a deficient number, since it is larger than the sum of its proper divisors (3863746667143).

11565553021401 is a wasteful number, since it uses less digits than its factorization.

11565553021401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140581671.

The product of its (nonzero) digits is 90000, while the sum is 39.

Adding to 11565553021401 its reverse (10412035556511), we get a palindrome (21977588577912).

The spelling of 11565553021401 in words is "eleven trillion, five hundred sixty-five billion, five hundred fifty-three million, twenty-one thousand, four hundred one".