251155223222 has 16 divisors (see below), whose sum is σ = 403737188832. Its totient is φ = 116871289920.

The previous prime is 251155223219. The next prime is 251155223233. The reversal of 251155223222 is 222322551152.

251155223222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×251155223222² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73780679 + ... + 73784082.

It is an arithmetic number, because the mean of its divisors is an integer number (25233574302).

Almost surely, 2^251155223222 is an apocalyptic number.

251155223222 is a deficient number, since it is larger than the sum of its proper divisors (152581965610).

251155223222 is a wasteful number, since it uses less digits than its factorization.

251155223222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147564823.

The product of its digits is 24000, while the sum is 32.

Adding to 251155223222 its reverse (222322551152), we get a palindrome (473477774374).

The spelling of 251155223222 in words is "two hundred fifty-one billion, one hundred fifty-five million, two hundred twenty-three thousand, two hundred twenty-two".