11556055001 has 4 divisors (see below), whose sum is σ = 11751920400. Its totient is φ = 11360189604.

The previous prime is 11556054989. The next prime is 11556055033. The reversal of 11556055001 is 10055065511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10055065511 = 71 ⋅141620641.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11556055001 is a prime.

It is a super-2 number, since 2×11556055001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11556055061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97932611 + ... + 97932728.

It is an arithmetic number, because the mean of its divisors is an integer number (2937980100).

Almost surely, 2^11556055001 is an apocalyptic number.

It is an amenable number.

11556055001 is a deficient number, since it is larger than the sum of its proper divisors (195865399).

11556055001 is an equidigital number, since it uses as much as digits as its factorization.

11556055001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195865398.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 11556055001 in words is "eleven billion, five hundred fifty-six million, fifty-five thousand, one".