11005515551 has 8 divisors (see below), whose sum is σ = 11158528080. Its totient is φ = 10852564032.

The previous prime is 11005515541. The next prime is 11005515553. The reversal of 11005515551 is 15551550011.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11005515551 is a prime.

It is a super-2 number, since 2×11005515551² (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 (11005515553) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 442616 + ... + 466818.

It is an arithmetic number, because the mean of its divisors is an integer number (1394816010).

Almost surely, 2^11005515551 is an apocalyptic number.

11005515551 is a deficient number, since it is larger than the sum of its proper divisors (153012529).

11005515551 is an equidigital number, since it uses as much as digits as its factorization.

11005515551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30505.

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

The spelling of 11005515551 in words is "eleven billion, five million, five hundred fifteen thousand, five hundred fifty-one".