345987709521 has 8 divisors (see below), whose sum is σ = 461331828960. Its totient is φ = 230651031552.

The previous prime is 345987709511. The next prime is 345987709541. The reversal of 345987709521 is 125907789543.

It is a happy number.

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

It is not a de Polignac number, because 345987709521 - 2⁷ = 345987709393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (345987709511) 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 7 ways as a sum of consecutive naturals, for example, 1750960 + ... + 1938513.

It is an arithmetic number, because the mean of its divisors is an integer number (57666478620).

Almost surely, 2^345987709521 is an apocalyptic number.

It is an amenable number.

345987709521 is a deficient number, since it is larger than the sum of its proper divisors (115344119439).

345987709521 is a wasteful number, since it uses less digits than its factorization.

345987709521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720735.

The product of its (nonzero) digits is 19051200, while the sum is 60.

The spelling of 345987709521 in words is "three hundred forty-five billion, nine hundred eighty-seven million, seven hundred nine thousand, five hundred twenty-one".