251151042505 has 16 divisors (see below), whose sum is σ = 334169379648. Its totient is φ = 179660952000.

The previous prime is 251151042469. The next prime is 251151042547. The reversal of 251151042505 is 505240151152.

It is not a de Polignac number, because 251151042505 - 2⁷ = 251151042377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37426011 + ... + 37432720.

It is an arithmetic number, because the mean of its divisors is an integer number (20885586228).

Almost surely, 2^251151042505 is an apocalyptic number.

It is an amenable number.

251151042505 is a deficient number, since it is larger than the sum of its proper divisors (83018337143).

251151042505 is a wasteful number, since it uses less digits than its factorization.

251151042505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74858808.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 251151042505 its reverse (505240151152), we get a palindrome (756391193657).

The spelling of 251151042505 in words is "two hundred fifty-one billion, one hundred fifty-one million, forty-two thousand, five hundred five".