11556556401 has 8 divisors (see below), whose sum is σ = 16594029760. Its totient is φ = 7111726992.

The previous prime is 11556556399. The next prime is 11556556411. The reversal of 11556556401 is 10465565511.

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

It is not a de Polignac number, because 11556556401 - 2¹ = 11556556399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 296321959 = 11556556401 / (1 + 1 + 5 + 5 + 6 + 5 + 5 + 6 + 4 + 0 + 1).

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 11556556401.

It is not an unprimeable number, because it can be changed into a prime (11556556411) 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, 148160941 + ... + 148161018.

It is an arithmetic number, because the mean of its divisors is an integer number (2074253720).

Almost surely, 2^11556556401 is an apocalyptic number.

It is an amenable number.

11556556401 is a deficient number, since it is larger than the sum of its proper divisors (5037473359).

11556556401 is a wasteful number, since it uses less digits than its factorization.

11556556401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296321975.

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

It can be divided in two parts, 1155 and 6556401, that added together give a palindrome (6557556).

The spelling of 11556556401 in words is "eleven billion, five hundred fifty-six million, five hundred fifty-six thousand, four hundred one".