251342161620343 has 4 divisors (see below), whose sum is σ = 251342255994480. Its totient is φ = 251342067246208.

The previous prime is 251342161620331. The next prime is 251342161620371. The reversal of 251342161620343 is 343026161243152.

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 251342161620343 - 2¹⁷ = 251342161489271 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 251342161620343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251342161624343) 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, 43072603 + ... + 48558556.

It is an arithmetic number, because the mean of its divisors is an integer number (62835563998620).

Almost surely, 2^{251342161620343} is an apocalyptic number.

251342161620343 is a deficient number, since it is larger than the sum of its proper divisors (94374137).

251342161620343 is an equidigital number, since it uses as much as digits as its factorization.

251342161620343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94374136.

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 251342161620343 in words is "two hundred fifty-one trillion, three hundred forty-two billion, one hundred sixty-one million, six hundred twenty thousand, three hundred forty-three".