6446121647 has 6 divisors (see below), whose sum is σ = 7498549728. Its totient is φ = 5525247084.

The previous prime is 6446121631. The next prime is 6446121733. The reversal of 6446121647 is 7461216446.

It is not a de Polignac number, because 6446121647 - 2⁴ = 6446121631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446121947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65776703 + ... + 65776800.

It is an arithmetic number, because the mean of its divisors is an integer number (1249758288).

Almost surely, 2^6446121647 is an apocalyptic number.

6446121647 is a deficient number, since it is larger than the sum of its proper divisors (1052428081).

6446121647 is a wasteful number, since it uses less digits than its factorization.

6446121647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131553517 (or 131553510 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 6446121647 is about 80287.7428191875. The cubic root of 6446121647 is about 1861.0848151083.

The spelling of 6446121647 in words is "six billion, four hundred forty-six million, one hundred twenty-one thousand, six hundred forty-seven".