6601651540 has 96 divisors (see below), whose sum is σ = 15651377280. Its totient is φ = 2318131200.

The previous prime is 6601651519. The next prime is 6601651577. The reversal of 6601651540 is 451561066.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6601651496 and 6601651505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 838020 + ... + 845860.

It is an arithmetic number, because the mean of its divisors is an integer number (163035180).

Almost surely, 2^6601651540 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 6601651540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7825688640).

6601651540 is an abundant number, since it is smaller than the sum of its proper divisors (9049725740).

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

6601651540 is a wasteful number, since it uses less digits than its factorization.

6601651540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7993 (or 7991 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 6601651540 is about 81250.5479366139. The cubic root of 6601651540 is about 1875.9339029999.

The spelling of 6601651540 in words is "six billion, six hundred one million, six hundred fifty-one thousand, five hundred forty".