6503974818 has 192 divisors, whose sum is σ = 15773740416. Its totient is φ = 1779148800.

The previous prime is 6503974723. The next prime is 6503974837. The reversal of 6503974818 is 8184793056.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 39901605 + ... + 39901767.

It is an arithmetic number, because the mean of its divisors is an integer number (82154898).

Almost surely, 2^6503974818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6503974818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7886870208).

6503974818 is an abundant number, since it is smaller than the sum of its proper divisors (9269765598).

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

6503974818 is a wasteful number, since it uses less digits than its factorization.

6503974818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 6503974818 is about 80647.2244903692. The cubic root of 6503974818 is about 1866.6359124964.

The spelling of 6503974818 in words is "six billion, five hundred three million, nine hundred seventy-four thousand, eight hundred eighteen".