6457708381 has 4 divisors (see below), whose sum is σ = 6460420672. Its totient is φ = 6454996092.

The previous prime is 6457708373. The next prime is 6457708399. The reversal of 6457708381 is 1838077546.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1838077546 = 2 ⋅919038773.

It is a cyclic number.

It is not a de Polignac number, because 6457708381 - 2³ = 6457708373 is a prime.

It is a super-2 number, since 2×6457708381² = 83403995068075282322, 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 (6457708351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1352571 + ... + 1357336.

It is an arithmetic number, because the mean of its divisors is an integer number (1615105168).

Almost surely, 2^6457708381 is an apocalyptic number.

It is an amenable number.

6457708381 is a deficient number, since it is larger than the sum of its proper divisors (2712291).

6457708381 is a wasteful number, since it uses less digits than its factorization.

6457708381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712290.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The square root of 6457708381 is about 80359.8679752524. The cubic root of 6457708381 is about 1862.1992313208.

The spelling of 6457708381 in words is "six billion, four hundred fifty-seven million, seven hundred eight thousand, three hundred eighty-one".