263221472251 has 4 divisors (see below), whose sum is σ = 274665884112. Its totient is φ = 251777060392.

The previous prime is 263221472231. The next prime is 263221472257. The reversal of 263221472251 is 152274122362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152274122362 = 2 ⋅76137061181.

It is a cyclic number.

It is not a de Polignac number, because 263221472251 - 2¹⁷ = 263221341179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 263221472251.

It is not an unprimeable number, because it can be changed into a prime (263221472257) 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, 5722205896 + ... + 5722205941.

It is an arithmetic number, because the mean of its divisors is an integer number (68666471028).

Almost surely, 2^263221472251 is an apocalyptic number.

263221472251 is a deficient number, since it is larger than the sum of its proper divisors (11444411861).

263221472251 is a wasteful number, since it uses less digits than its factorization.

263221472251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11444411860.

The product of its digits is 80640, while the sum is 37.

The spelling of 263221472251 in words is "two hundred sixty-three billion, two hundred twenty-one million, four hundred seventy-two thousand, two hundred fifty-one".