6400881457 has 4 divisors (see below), whose sum is σ = 6607361536. Its totient is φ = 6194401380.

The previous prime is 6400881437. The next prime is 6400881511. The reversal of 6400881457 is 7541880046.

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 6400881457 - 2³¹ = 4253397809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6400881437) 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, 103239993 + ... + 103240054.

It is an arithmetic number, because the mean of its divisors is an integer number (1651840384).

Almost surely, 2^6400881457 is an apocalyptic number.

It is an amenable number.

6400881457 is a deficient number, since it is larger than the sum of its proper divisors (206480079).

6400881457 is a wasteful number, since it uses less digits than its factorization.

6400881457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206480078.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 6400881457 is about 80005.5089165740. The cubic root of 6400881457 is about 1856.7207662191.

The spelling of 6400881457 in words is "six billion, four hundred million, eight hundred eighty-one thousand, four hundred fifty-seven".