345307416217521 has 16 divisors (see below), whose sum is σ = 461628613520640. Its totient is φ = 229596347546640.

The previous prime is 345307416217513. The next prime is 345307416217531. The reversal of 345307416217521 is 125712614703543.

It is not a de Polignac number, because 345307416217521 - 2³ = 345307416217513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (345307416217531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93948175 + ... + 97554468.

It is an arithmetic number, because the mean of its divisors is an integer number (28851788345040).

Almost surely, 2^{345307416217521} is an apocalyptic number.

It is an amenable number.

345307416217521 is a deficient number, since it is larger than the sum of its proper divisors (116321197303119).

345307416217521 is a wasteful number, since it uses less digits than its factorization.

345307416217521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191504236.

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 345307416217521 in words is "three hundred forty-five trillion, three hundred seven billion, four hundred sixteen million, two hundred seventeen thousand, five hundred twenty-one".