6447140669 has 4 divisors (see below), whose sum is σ = 6447649344. Its totient is φ = 6446631996.

The previous prime is 6447140617. The next prime is 6447140701. The reversal of 6447140669 is 9660417446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6447140669 - 2¹⁶ = 6447075133 is a prime.

It is a super-2 number, since 2×6447140669² = 83131245611747535122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447140269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234827 + ... + 260840.

It is an arithmetic number, because the mean of its divisors is an integer number (1611912336).

Almost surely, 2^6447140669 is an apocalyptic number.

It is an amenable number.

6447140669 is a deficient number, since it is larger than the sum of its proper divisors (508675).

6447140669 is a wasteful number, since it uses less digits than its factorization.

6447140669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508674.

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 6447140669 is about 80294.0886304839. The cubic root of 6447140669 is about 1861.1828785408.

The spelling of 6447140669 in words is "six billion, four hundred forty-seven million, one hundred forty thousand, six hundred sixty-nine".