251303016563 has 4 divisors (see below), whose sum is σ = 255422738208. Its totient is φ = 247183294920.

The previous prime is 251303016491. The next prime is 251303016607. The reversal of 251303016563 is 365610303152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251303016563 - 2¹⁰ = 251303015539 is a prime.

It is a super-2 number, since 2×251303016563² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251303016463) 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, 2059860731 + ... + 2059860852.

It is an arithmetic number, because the mean of its divisors is an integer number (63855684552).

Almost surely, 2^251303016563 is an apocalyptic number.

251303016563 is a deficient number, since it is larger than the sum of its proper divisors (4119721645).

251303016563 is an equidigital number, since it uses as much as digits as its factorization.

251303016563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119721644.

The product of its (nonzero) digits is 48600, while the sum is 35.

The spelling of 251303016563 in words is "two hundred fifty-one billion, three hundred three million, sixteen thousand, five hundred sixty-three".