251351330042 has 8 divisors (see below), whose sum is σ = 377996217300. Its totient is φ = 125352590944.

The previous prime is 251351330029. The next prime is 251351330053. The reversal of 251351330042 is 240033153152.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 251290661521 + 60668521 = 501289^2 + 7789^2 .

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

It is a super-2 number, since 2×251351330042² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251351329987 and 251351330014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161536067 + ... + 161537622.

Almost surely, 2^251351330042 is an apocalyptic number.

251351330042 is a deficient number, since it is larger than the sum of its proper divisors (126644887258).

251351330042 is a wasteful number, since it uses less digits than its factorization.

251351330042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323074080.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 251351330042 its reverse (240033153152), we get a palindrome (491384483194).

The spelling of 251351330042 in words is "two hundred fifty-one billion, three hundred fifty-one million, three hundred thirty thousand, forty-two".