6491289364128 has 72 divisors (see below), whose sum is σ = 18667015485300. Its totient is φ = 2139451167744.

The previous prime is 6491289364081. The next prime is 6491289364139. The reversal of 6491289364128 is 8214639821946.

6491289364128 is a `hidden beast` number, since 6 + 4 + 9 + 128 + 93 + 6 + 412 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6323756325264 + 167533038864 = 2514708^2 + 409308^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126599083 + ... + 126650346.

Almost surely, 2^{6491289364128} is an apocalyptic number.

It is an amenable number.

6491289364128 is an abundant number, since it is smaller than the sum of its proper divisors (12175726121172).

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

6491289364128 is a wasteful number, since it uses less digits than its factorization.

6491289364128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253249534 (or 253249523 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 63.

The spelling of 6491289364128 in words is "six trillion, four hundred ninety-one billion, two hundred eighty-nine million, three hundred sixty-four thousand, one hundred twenty-eight".