6615958140 has 216 divisors, whose sum is σ = 22194965520. Its totient is φ = 1593968640.

The previous prime is 6615958127. The next prime is 6615958183. The reversal of 6615958140 is 418595166.

6615958140 is a `hidden beast` number, since 6 + 61 + 5 + 9 + 581 + 4 + 0 = 666.

It is a super-2 number, since 2×6615958140² = 87541804220464519200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3897772 + ... + 3899468.

It is an arithmetic number, because the mean of its divisors is an integer number (102754470).

Almost surely, 2^6615958140 is an apocalyptic number.

6615958140 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 6615958140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11097482760).

6615958140 is an abundant number, since it is smaller than the sum of its proper divisors (15579007380).

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

6615958140 is a wasteful number, since it uses less digits than its factorization.

6615958140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 6615958140 is about 81338.5403114661. The cubic root of 6615958140 is about 1877.2880526324.

The spelling of 6615958140 in words is "six billion, six hundred fifteen million, nine hundred fifty-eight thousand, one hundred forty".