11251223661 has 16 divisors (see below), whose sum is σ = 15148296000. Its totient is φ = 7427543808.

The previous prime is 11251223653. The next prime is 11251223671. The reversal of 11251223661 is 16632215211.

It is not a de Polignac number, because 11251223661 - 2³ = 11251223653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11251223671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 927765 + ... + 939813.

It is an arithmetic number, because the mean of its divisors is an integer number (946768500).

Almost surely, 2^11251223661 is an apocalyptic number.

It is an amenable number.

11251223661 is a deficient number, since it is larger than the sum of its proper divisors (3897072339).

11251223661 is a wasteful number, since it uses less digits than its factorization.

11251223661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15068.

The product of its digits is 4320, while the sum is 30.

Adding to 11251223661 its reverse (16632215211), we get a palindrome (27883438872).

The spelling of 11251223661 in words is "eleven billion, two hundred fifty-one million, two hundred twenty-three thousand, six hundred sixty-one".