6647491406 has 8 divisors (see below), whose sum is σ = 9972031080. Its totient is φ = 3323481048.

The previous prime is 6647491399. The next prime is 6647491421. The reversal of 6647491406 is 6041947466.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 99281 + ... + 152156.

It is an arithmetic number, because the mean of its divisors is an integer number (1246503885).

Almost surely, 2^6647491406 is an apocalyptic number.

6647491406 is a deficient number, since it is larger than the sum of its proper divisors (3324539674).

6647491406 is a wasteful number, since it uses less digits than its factorization.

6647491406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264658.

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 6647491406 is about 81532.1495239761. The cubic root of 6647491406 is about 1880.2658638266.

The spelling of 6647491406 in words is "six billion, six hundred forty-seven million, four hundred ninety-one thousand, four hundred six".