251319985378559 has 4 divisors (see below), whose sum is σ = 251330786037240. Its totient is φ = 251309184719880.

The previous prime is 251319985378459. The next prime is 251319985378589. The reversal of 251319985378559 is 955873589913152.

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 251319985378559 - 2³² = 251315690411263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251319985378589) 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, 5400294437 + ... + 5400340974.

It is an arithmetic number, because the mean of its divisors is an integer number (62832696509310).

Almost surely, 2^{251319985378559} is an apocalyptic number.

251319985378559 is a deficient number, since it is larger than the sum of its proper divisors (10800658681).

251319985378559 is a wasteful number, since it uses less digits than its factorization.

251319985378559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10800658680.

The product of its digits is 3674160000, while the sum is 80.

The spelling of 251319985378559 in words is "two hundred fifty-one trillion, three hundred nineteen billion, nine hundred eighty-five million, three hundred seventy-eight thousand, five hundred fifty-nine".