648455061820 has 192 divisors, whose sum is σ = 1551965184000. Its totient is φ = 226291000320.

The previous prime is 648455061811. The next prime is 648455061893. The reversal of 648455061820 is 28160554846.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53369106 + ... + 53381254.

It is an arithmetic number, because the mean of its divisors is an integer number (8083152000).

Almost surely, 2^648455061820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648455061820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (775982592000).

648455061820 is an abundant number, since it is smaller than the sum of its proper divisors (903510122180).

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

648455061820 is a wasteful number, since it uses less digits than its factorization.

648455061820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12428 (or 12426 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 49.

The spelling of 648455061820 in words is "six hundred forty-eight billion, four hundred fifty-five million, sixty-one thousand, eight hundred twenty".