345863251981 has 8 divisors (see below), whose sum is σ = 372993470360. Its totient is φ = 318808084032.

The previous prime is 345863251919. The next prime is 345863251999. The reversal of 345863251981 is 189152368543.

It can be written as a sum of positive squares in 4 ways, for example, as 4679928100 + 341183323881 = 68410^2 + 584109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 345863251981 - 2⁹ = 345863251469 is a prime.

It is a super-3 number, since 3×345863251981³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345863251381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18753030 + ... + 18771463.

It is an arithmetic number, because the mean of its divisors is an integer number (46624183795).

Almost surely, 2^345863251981 is an apocalyptic number.

It is an amenable number.

345863251981 is a deficient number, since it is larger than the sum of its proper divisors (27130218379).

345863251981 is a wasteful number, since it uses less digits than its factorization.

345863251981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37525215.

The product of its digits is 6220800, while the sum is 55.

The spelling of 345863251981 in words is "three hundred forty-five billion, eight hundred sixty-three million, two hundred fifty-one thousand, nine hundred eighty-one".