6497471640 has 64 divisors (see below), whose sum is σ = 21264456960. Its totient is φ = 1575144320.

The previous prime is 6497471599. The next prime is 6497471657. The reversal of 6497471640 is 461747946.

It is a self number, because there is not a number n which added to its sum of digits gives 6497471640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2459844 + ... + 2462483.

It is an arithmetic number, because the mean of its divisors is an integer number (332257140).

Almost surely, 2^6497471640 is an apocalyptic number.

6497471640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6497471640 is an abundant number, since it is smaller than the sum of its proper divisors (14766985320).

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

6497471640 is a wasteful number, since it uses less digits than its factorization.

6497471640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4922352 (or 4922348 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The square root of 6497471640 is about 80606.8957347943. The cubic root of 6497471640 is about 1866.0135692859.

The spelling of 6497471640 in words is "six billion, four hundred ninety-seven million, four hundred seventy-one thousand, six hundred forty".