11155055501 has 4 divisors (see below), whose sum is σ = 11158676832. Its totient is φ = 11151434172.

The previous prime is 11155055479. The next prime is 11155055533. The reversal of 11155055501 is 10555055111.

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: 10555055111 = 3923 ⋅2690557.

It is a cyclic number.

It is not a de Polignac number, because 11155055501 - 2⁶ = 11155055437 is a prime.

It is a super-2 number, since 2×11155055501² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155055101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806041 + ... + 1812206.

It is an arithmetic number, because the mean of its divisors is an integer number (2789669208).

Almost surely, 2^11155055501 is an apocalyptic number.

It is an amenable number.

11155055501 is a deficient number, since it is larger than the sum of its proper divisors (3621331).

11155055501 is an equidigital number, since it uses as much as digits as its factorization.

11155055501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3621330.

The product of its (nonzero) digits is 3125, while the sum is 29.

The spelling of 11155055501 in words is "eleven billion, one hundred fifty-five million, fifty-five thousand, five hundred one".