6451381457 has 4 divisors (see below), whose sum is σ = 6625743156. Its totient is φ = 6277019760.

The previous prime is 6451381403. The next prime is 6451381463. The reversal of 6451381457 is 7541831546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5108818576 + 1342562881 = 71476^2 + 36641^2 .

It is a cyclic number.

It is not a de Polignac number, because 6451381457 - 2⁶ = 6451381393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6451381477) 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, 87180794 + ... + 87180867.

It is an arithmetic number, because the mean of its divisors is an integer number (1656435789).

Almost surely, 2^6451381457 is an apocalyptic number.

It is an amenable number.

6451381457 is a deficient number, since it is larger than the sum of its proper divisors (174361699).

6451381457 is a wasteful number, since it uses less digits than its factorization.

6451381457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174361698.

The product of its digits is 403200, while the sum is 44.

The square root of 6451381457 is about 80320.4921361915. The cubic root of 6451381457 is about 1861.5908708828.

The spelling of 6451381457 in words is "six billion, four hundred fifty-one million, three hundred eighty-one thousand, four hundred fifty-seven".