6518421956 has 24 divisors (see below), whose sum is σ = 11789051904. Its totient is φ = 3150368640.

The previous prime is 6518421953. The next prime is 6518421977. The reversal of 6518421956 is 6591248156.

It is a self number, because there is not a number n which added to its sum of digits gives 6518421956.

It is not an unprimeable number, because it can be changed into a prime (6518421953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76556 + ... + 137468.

It is an arithmetic number, because the mean of its divisors is an integer number (491210496).

Almost surely, 2^6518421956 is an apocalyptic number.

It is an amenable number.

6518421956 is a deficient number, since it is larger than the sum of its proper divisors (5270629948).

6518421956 is a wasteful number, since it uses less digits than its factorization.

6518421956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61811 (or 61809 counting only the distinct ones).

The product of its digits is 518400, while the sum is 47.

The square root of 6518421956 is about 80736.7447696524. The cubic root of 6518421956 is about 1868.0169963468.

The spelling of 6518421956 in words is "six billion, five hundred eighteen million, four hundred twenty-one thousand, nine hundred fifty-six".