648820555997 has 8 divisors (see below), whose sum is σ = 655412873856. Its totient is φ = 642233874672.

The previous prime is 648820555961. The next prime is 648820556017. The reversal of 648820555997 is 799555028846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648820555997 - 2¹⁸ = 648820293853 is a prime.

It is a super-2 number, since 2×648820555997² (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 (648820255997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177553 + ... + 1638374.

It is an arithmetic number, because the mean of its divisors is an integer number (81926609232).

Almost surely, 2^648820555997 is an apocalyptic number.

It is an amenable number.

648820555997 is a deficient number, since it is larger than the sum of its proper divisors (6592317859).

648820555997 is a wasteful number, since it uses less digits than its factorization.

648820555997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818267.

The product of its (nonzero) digits is 217728000, while the sum is 68.

The spelling of 648820555997 in words is "six hundred forty-eight billion, eight hundred twenty million, five hundred fifty-five thousand, nine hundred ninety-seven".