6278660643 has 64 divisors (see below), whose sum is σ = 9299404800. Its totient is φ = 3752386560.

The previous prime is 6278660639. The next prime is 6278660669. The reversal of 6278660643 is 3460668726.

It is a Cunningham number, because it is equal to 79238²-1.

It is not a de Polignac number, because 6278660643 - 2² = 6278660639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6278660592 and 6278660601.

It is not an unprimeable number, because it can be changed into a prime (6278660693) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14500155 + ... + 14500587.

It is an arithmetic number, because the mean of its divisors is an integer number (145303200).

Almost surely, 2^6278660643 is an apocalyptic number.

6278660643 is a deficient number, since it is larger than the sum of its proper divisors (3020744157).

6278660643 is a wasteful number, since it uses less digits than its factorization.

6278660643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652.

The product of its (nonzero) digits is 1741824, while the sum is 48.

The square root of 6278660643 is about 79237.9999936899. Note that the first 5 decimals coincide. The cubic root of 6278660643 is about 1844.8271019889.

The spelling of 6278660643 in words is "six billion, two hundred seventy-eight million, six hundred sixty thousand, six hundred forty-three".