251040045242 has 8 divisors (see below), whose sum is σ = 430354363296. Its totient is φ = 107588590812.

The previous prime is 251040045203. The next prime is 251040045247. The reversal of 251040045242 is 242540040152.

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

It is a super-2 number, since 2×251040045242² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251040045247) 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, 8965715888 + ... + 8965715915.

It is an arithmetic number, because the mean of its divisors is an integer number (53794295412).

Almost surely, 2^251040045242 is an apocalyptic number.

251040045242 is a deficient number, since it is larger than the sum of its proper divisors (179314318054).

251040045242 is a wasteful number, since it uses less digits than its factorization.

251040045242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17931431812.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 251040045242 its reverse (242540040152), we get a palindrome (493580085394).

The spelling of 251040045242 in words is "two hundred fifty-one billion, forty million, forty-five thousand, two hundred forty-two".