6640655351 has 16 divisors (see below), whose sum is σ = 7271244288. Its totient is φ = 6014601600.

The previous prime is 6640655309. The next prime is 6640655387. The reversal of 6640655351 is 1535560466.

6640655351 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6640655351 - 2¹⁴ = 6640638967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6640655299 and 6640655308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640654351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5393906 + ... + 5395136.

It is an arithmetic number, because the mean of its divisors is an integer number (454452768).

Almost surely, 2^6640655351 is an apocalyptic number.

6640655351 is a deficient number, since it is larger than the sum of its proper divisors (630588937).

6640655351 is a wasteful number, since it uses less digits than its factorization.

6640655351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662.

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 6640655351 is about 81490.2162900553. The cubic root of 6640655351 is about 1879.6211088525.

The spelling of 6640655351 in words is "six billion, six hundred forty million, six hundred fifty-five thousand, three hundred fifty-one".