648411604981638 has 16 divisors (see below), whose sum is σ = 1324415193154560. Its totient is φ = 211538537795336.

The previous prime is 648411604981627. The next prime is 648411604981663. The reversal of 648411604981638 is 836189406114846.

It is a congruent number.

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, 1149665965998 + ... + 1149665966561.

It is an arithmetic number, because the mean of its divisors is an integer number (82775949572160).

Almost surely, 2^{648411604981638} is an apocalyptic number.

648411604981638 is an abundant number, since it is smaller than the sum of its proper divisors (676003588172922).

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

648411604981638 is a wasteful number, since it uses less digits than its factorization.

648411604981638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299331932611.

The product of its (nonzero) digits is 191102976, while the sum is 69.

The spelling of 648411604981638 in words is "six hundred forty-eight trillion, four hundred eleven billion, six hundred four million, nine hundred eighty-one thousand, six hundred thirty-eight".