646541526436666 has 32 divisors (see below), whose sum is σ = 1108496545390080. Its totient is φ = 277054316686896.

The previous prime is 646541526436649. The next prime is 646541526436667. The reversal of 646541526436666 is 666634625145646.

It is a junction number, because it is equal to n+sod(n) for n = 646541526436595 and 646541526436604.

It is not an unprimeable number, because it can be changed into a prime (646541526436667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6947605245 + ... + 6947698303.

It is an arithmetic number, because the mean of its divisors is an integer number (34640517043440).

Almost surely, 2^{646541526436666} is an apocalyptic number.

646541526436666 is a deficient number, since it is larger than the sum of its proper divisors (461955018953414).

646541526436666 is a wasteful number, since it uses less digits than its factorization.

646541526436666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150258.

The product of its digits is 2687385600, while the sum is 70.

The spelling of 646541526436666 in words is "six hundred forty-six trillion, five hundred forty-one billion, five hundred twenty-six million, four hundred thirty-six thousand, six hundred sixty-six".