251355402223 has 4 divisors (see below), whose sum is σ = 252860524560. Its totient is φ = 249850279888.

The previous prime is 251355402217. The next prime is 251355402241. The reversal of 251355402223 is 322204553152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251355402223 - 2⁵ = 251355402191 is a prime.

It is a super-2 number, since 2×251355402223² (a number of 24 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 (251355400223) 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, 752560918 + ... + 752561251.

It is an arithmetic number, because the mean of its divisors is an integer number (63215131140).

Almost surely, 2^251355402223 is an apocalyptic number.

251355402223 is a deficient number, since it is larger than the sum of its proper divisors (1505122337).

251355402223 is a wasteful number, since it uses less digits than its factorization.

251355402223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505122336.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 251355402223 its reverse (322204553152), we get a palindrome (573559955375).

The spelling of 251355402223 in words is "two hundred fifty-one billion, three hundred fifty-five million, four hundred two thousand, two hundred twenty-three".