646526425641040 has 80 divisors (see below), whose sum is σ = 1718234127048960. Its totient is φ = 221624776857600.

The previous prime is 646526425640983. The next prime is 646526425641059. The reversal of 646526425641040 is 40146524625646.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104881545 + ... + 110874664.

It is an arithmetic number, because the mean of its divisors is an integer number (21477926588112).

Almost surely, 2^{646526425641040} is an apocalyptic number.

It is an amenable number.

646526425641040 is an abundant number, since it is smaller than the sum of its proper divisors (1071707701407920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646526425641040 is a wasteful number, since it uses less digits than its factorization.

646526425641040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215761580 (or 215761574 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 55.

The spelling of 646526425641040 in words is "six hundred forty-six trillion, five hundred twenty-six billion, four hundred twenty-five million, six hundred forty-one thousand, forty".