251366146349 has 4 divisors (see below), whose sum is σ = 252967204764. Its totient is φ = 249765087936.

The previous prime is 251366146333. The next prime is 251366146393. The reversal of 251366146349 is 943641663152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 89210937124 + 162155209225 = 298682^2 + 402685^2 .

It is a cyclic number.

It is not a de Polignac number, because 251366146349 - 2⁴ = 251366146333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251366146297 and 251366146306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251366146399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800528972 + ... + 800529285.

It is an arithmetic number, because the mean of its divisors is an integer number (63241801191).

Almost surely, 2^251366146349 is an apocalyptic number.

It is an amenable number.

251366146349 is a deficient number, since it is larger than the sum of its proper divisors (1601058415).

251366146349 is a wasteful number, since it uses less digits than its factorization.

251366146349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601058414.

The product of its digits is 2799360, while the sum is 50.

The spelling of 251366146349 in words is "two hundred fifty-one billion, three hundred sixty-six million, one hundred forty-six thousand, three hundred forty-nine".