648820556047 has 4 divisors (see below), whose sum is σ = 649532763936. Its totient is φ = 648108348160.

The previous prime is 648820556017. The next prime is 648820556057. The reversal of 648820556047 is 740655028846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 648820556047 - 2²³ = 648812167439 is a prime.

It is a super-2 number, since 2×648820556047² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648820556017) 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, 356102578 + ... + 356104399.

It is an arithmetic number, because the mean of its divisors is an integer number (162383190984).

Almost surely, 2^648820556047 is an apocalyptic number.

648820556047 is a deficient number, since it is larger than the sum of its proper divisors (712207889).

648820556047 is an equidigital number, since it uses as much as digits as its factorization.

648820556047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712207888.

The product of its (nonzero) digits is 12902400, while the sum is 55.

The spelling of 648820556047 in words is "six hundred forty-eight billion, eight hundred twenty million, five hundred fifty-six thousand, forty-seven".