6491018880 has 384 divisors, whose sum is σ = 23944377600. Its totient is φ = 1614643200.

The previous prime is 6491018869. The next prime is 6491018909. The reversal of 6491018880 is 888101946.

6491018880 is a `hidden beast` number, since 6 + 491 + 0 + 1 + 88 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×6491018880² = 84266652201032908800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14785701 + ... + 14786139.

It is an arithmetic number, because the mean of its divisors is an integer number (62355150).

Almost surely, 2^6491018880 is an apocalyptic number.

6491018880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6491018880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11972188800).

6491018880 is an abundant number, since it is smaller than the sum of its proper divisors (17453358720).

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

6491018880 is a wasteful number, since it uses less digits than its factorization.

6491018880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 6491018880 is about 80566.8596880876. The cubic root of 6491018880 is about 1865.3956404148.

The spelling of 6491018880 in words is "six billion, four hundred ninety-one million, eighteen thousand, eight hundred eighty".