648355385501 has 4 divisors (see below), whose sum is σ = 676544750112. Its totient is φ = 620166020892.

The previous prime is 648355385449. The next prime is 648355385519. The reversal of 648355385501 is 105583553846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648355385501 - 2¹⁴ = 648355369117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648355385201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14094682271 + ... + 14094682316.

It is an arithmetic number, because the mean of its divisors is an integer number (169136187528).

Almost surely, 2^648355385501 is an apocalyptic number.

It is an amenable number.

648355385501 is a deficient number, since it is larger than the sum of its proper divisors (28189364611).

648355385501 is a wasteful number, since it uses less digits than its factorization.

648355385501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28189364610.

The product of its (nonzero) digits is 8640000, while the sum is 53.

The spelling of 648355385501 in words is "six hundred forty-eight billion, three hundred fifty-five million, three hundred eighty-five thousand, five hundred one".