251223561355 has 16 divisors (see below), whose sum is σ = 324720293184. Its totient is φ = 185483422080.

The previous prime is 251223561343. The next prime is 251223561373. The reversal of 251223561355 is 553165322152.

It is not a de Polignac number, because 251223561355 - 2¹⁵ = 251223528587 is a prime.

It is a super-2 number, since 2×251223561355² (a number of 24 digits) contains 22 as substring.

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, 25359 + ... + 709288.

It is an arithmetic number, because the mean of its divisors is an integer number (20295018324).

Almost surely, 2^251223561355 is an apocalyptic number.

251223561355 is a deficient number, since it is larger than the sum of its proper divisors (73496731829).

251223561355 is a wasteful number, since it uses less digits than its factorization.

251223561355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739926.

The product of its digits is 270000, while the sum is 40.

The spelling of 251223561355 in words is "two hundred fifty-one billion, two hundred twenty-three million, five hundred sixty-one thousand, three hundred fifty-five".