6651406040 has 16 divisors (see below), whose sum is σ = 14965663680. Its totient is φ = 2660562400.

The previous prime is 6651405991. The next prime is 6651406051. The reversal of 6651406040 is 406041566.

It is a junction number, because it is equal to n+sod(n) for n = 6651405988 and 6651406006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83142536 + ... + 83142615.

It is an arithmetic number, because the mean of its divisors is an integer number (935353980).

Almost surely, 2^6651406040 is an apocalyptic number.

It is an amenable number.

6651406040 is an abundant number, since it is smaller than the sum of its proper divisors (8314257640).

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

6651406040 is a wasteful number, since it uses less digits than its factorization.

6651406040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166285162 (or 166285158 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6651406040 is about 81556.1526802239. The cubic root of 6651406040 is about 1880.6348806407.

The spelling of 6651406040 in words is "six billion, six hundred fifty-one million, four hundred six thousand, forty".