646015521126063 has 64 divisors (see below), whose sum is σ = 950711946508800. Its totient is φ = 386923789824000.

The previous prime is 646015521126029. The next prime is 646015521126133. The reversal of 646015521126063 is 360621125510646.

It is a happy number.

It is not a de Polignac number, because 646015521126063 - 2³⁰ = 646014447384239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646015521126263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68066112748 + ... + 68066122238.

It is an arithmetic number, because the mean of its divisors is an integer number (14854874164200).

Almost surely, 2^{646015521126063} is an apocalyptic number.

646015521126063 is a deficient number, since it is larger than the sum of its proper divisors (304696425382737).

646015521126063 is a wasteful number, since it uses less digits than its factorization.

646015521126063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19224.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 646015521126063 in words is "six hundred forty-six trillion, fifteen billion, five hundred twenty-one million, one hundred twenty-six thousand, sixty-three".