6456971878 has 16 divisors (see below), whose sum is σ = 11250556704. Its totient is φ = 2721908160.

The previous prime is 6456971869. The next prime is 6456971881. The reversal of 6456971878 is 8781796546.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3779575 + ... + 3781282.

It is an arithmetic number, because the mean of its divisors is an integer number (703159794).

Almost surely, 2^6456971878 is an apocalyptic number.

6456971878 is a deficient number, since it is larger than the sum of its proper divisors (4793584826).

6456971878 is a wasteful number, since it uses less digits than its factorization.

6456971878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7560927.

The product of its digits is 20321280, while the sum is 61.

The square root of 6456971878 is about 80355.2853146574. The cubic root of 6456971878 is about 1862.1284338912.

The spelling of 6456971878 in words is "six billion, four hundred fifty-six million, nine hundred seventy-one thousand, eight hundred seventy-eight".