6451271964 has 18 divisors (see below), whose sum is σ = 16307382000. Its totient is φ = 2150423976.

The previous prime is 6451271941. The next prime is 6451271993. The reversal of 6451271964 is 4691721546.

6451271964 is a `hidden beast` number, since 6 + 4 + 512 + 71 + 9 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89600964 + ... + 89601035.

Almost surely, 2^6451271964 is an apocalyptic number.

It is an amenable number.

6451271964 is an abundant number, since it is smaller than the sum of its proper divisors (9856110036).

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

6451271964 is a wasteful number, since it uses less digits than its factorization.

6451271964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179202009 (or 179202004 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 6451271964 is about 80319.8105326451. The cubic root of 6451271964 is about 1861.5803391683.

The spelling of 6451271964 in words is "six billion, four hundred fifty-one million, two hundred seventy-one thousand, nine hundred sixty-four".