646131405145 has 8 divisors (see below), whose sum is σ = 783034495560. Its totient is φ = 511787251200.

The previous prime is 646131405107. The next prime is 646131405163. The reversal of 646131405145 is 541504131646.

646131405145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 358689594649 + 287441810496 = 598907^2 + 536136^2 .

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

It is not a de Polignac number, because 646131405145 - 2³⁵ = 611771666777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646131405098 and 646131405107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639733560 + ... + 639734569.

It is an arithmetic number, because the mean of its divisors is an integer number (97879311945).

Almost surely, 2^646131405145 is an apocalyptic number.

It is an amenable number.

646131405145 is a deficient number, since it is larger than the sum of its proper divisors (136903090415).

646131405145 is a wasteful number, since it uses less digits than its factorization.

646131405145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279468235.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 646131405145 in words is "six hundred forty-six billion, one hundred thirty-one million, four hundred five thousand, one hundred forty-five".