645415122513 has 32 divisors (see below), whose sum is σ = 1005268672512. Its totient is φ = 360686289600.

The previous prime is 645415122511. The next prime is 645415122529. The reversal of 645415122513 is 315221514546.

645415122513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645415122513 - 2¹ = 645415122511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645415122511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 586153 + ... + 1278438.

It is an arithmetic number, because the mean of its divisors is an integer number (31414646016).

Almost surely, 2^645415122513 is an apocalyptic number.

It is an amenable number.

645415122513 is a deficient number, since it is larger than the sum of its proper divisors (359853549999).

645415122513 is a wasteful number, since it uses less digits than its factorization.

645415122513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864965.

The product of its digits is 144000, while the sum is 39.

The spelling of 645415122513 in words is "six hundred forty-five billion, four hundred fifteen million, one hundred twenty-two thousand, five hundred thirteen".