251265251901 has 4 divisors (see below), whose sum is σ = 335020335872. Its totient is φ = 167510167932.

The previous prime is 251265251863. The next prime is 251265251903. The reversal of 251265251901 is 109152562152.

251265251901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 251265251901 - 2⁷ = 251265251773 is a prime.

It is a super-2 number, since 2×251265251901² (a number of 24 digits) contains 22 as substring.

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 251265251901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251265251903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41877541981 + ... + 41877541986.

It is an arithmetic number, because the mean of its divisors is an integer number (83755083968).

Almost surely, 2^251265251901 is an apocalyptic number.

It is an amenable number.

251265251901 is a deficient number, since it is larger than the sum of its proper divisors (83755083971).

251265251901 is an equidigital number, since it uses as much as digits as its factorization.

251265251901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83755083970.

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 251265251901 in words is "two hundred fifty-one billion, two hundred sixty-five million, two hundred fifty-one thousand, nine hundred one".