6447138500278 has 32 divisors (see below), whose sum is σ = 11948364806400. Its totient is φ = 2546888279904.

The previous prime is 6447138500269. The next prime is 6447138500279. The reversal of 6447138500278 is 8720058317446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447138500279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327522088 + ... + 327541771.

It is an arithmetic number, because the mean of its divisors is an integer number (373386400200).

Almost surely, 2^{6447138500278} is an apocalyptic number.

6447138500278 is a deficient number, since it is larger than the sum of its proper divisors (5501226306122).

6447138500278 is a wasteful number, since it uses less digits than its factorization.

6447138500278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655063924.

The product of its (nonzero) digits is 9031680, while the sum is 55.

The spelling of 6447138500278 in words is "six trillion, four hundred forty-seven billion, one hundred thirty-eight million, five hundred thousand, two hundred seventy-eight".