6615062640 has 200 divisors, whose sum is σ = 23075131728. Its totient is φ = 1763596800.

The previous prime is 6615062633. The next prime is 6615062737. The reversal of 6615062640 is 462605166.

It is a happy number.

6615062640 is a `hidden beast` number, since 6 + 6 + 1 + 5 + 0 + 6 + 2 + 640 = 666.

It is a super-2 number, since 2×6615062640² = 87518107462247539200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6615062595 and 6615062604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1572540 + ... + 1576740.

Almost surely, 2^6615062640 is an apocalyptic number.

6615062640 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 6615062640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11537565864).

6615062640 is an abundant number, since it is smaller than the sum of its proper divisors (16460069088).

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

6615062640 is an frugal number, since it uses more digits than its factorization.

6615062640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4241 (or 4211 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 6615062640 is about 81333.0353546454. The cubic root of 6615062640 is about 1877.2033489875.

The spelling of 6615062640 in words is "six billion, six hundred fifteen million, sixty-two thousand, six hundred forty".