222143511551 has 4 divisors (see below), whose sum is σ = 239231473992. Its totient is φ = 205055549112.

The previous prime is 222143511539. The next prime is 222143511587. The reversal of 222143511551 is 155115341222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155115341222 = 2 ⋅77557670611.

It is a cyclic number.

It is not a de Polignac number, because 222143511551 - 2⁶ = 222143511487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222143531551) 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, 8543981201 + ... + 8543981226.

It is an arithmetic number, because the mean of its divisors is an integer number (59807868498).

Almost surely, 2^222143511551 is an apocalyptic number.

222143511551 is a deficient number, since it is larger than the sum of its proper divisors (17087962441).

222143511551 is a wasteful number, since it uses less digits than its factorization.

222143511551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17087962440.

The product of its digits is 12000, while the sum is 32.

Adding to 222143511551 its reverse (155115341222), we get a palindrome (377258852773).

The spelling of 222143511551 in words is "two hundred twenty-two billion, one hundred forty-three million, five hundred eleven thousand, five hundred fifty-one".