646435645523445 has 64 divisors (see below), whose sum is σ = 1045301542790400. Its totient is φ = 341115080337408.

The previous prime is 646435645523431. The next prime is 646435645523519. The reversal of 646435645523445 is 544325546534646.

It is a happy number.

646435645523445 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 646435645523445 - 2⁴ = 646435645523429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1604163754 + ... + 1604566676.

It is an arithmetic number, because the mean of its divisors is an integer number (16332836606100).

Almost surely, 2^{646435645523445} is an apocalyptic number.

It is an amenable number.

646435645523445 is a deficient number, since it is larger than the sum of its proper divisors (398865897266955).

646435645523445 is a wasteful number, since it uses less digits than its factorization.

646435645523445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405654.

The product of its digits is 2488320000, while the sum is 66.

The spelling of 646435645523445 in words is "six hundred forty-six trillion, four hundred thirty-five billion, six hundred forty-five million, five hundred twenty-three thousand, four hundred forty-five".