6451494563 has 4 divisors (see below), whose sum is σ = 6475301088. Its totient is φ = 6427688040.

The previous prime is 6451494559. The next prime is 6451494571. The reversal of 6451494563 is 3654941546.

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

It is a cyclic number.

It is not a de Polignac number, because 6451494563 - 2² = 6451494559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6451496563) 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, 11902856 + ... + 11903397.

It is an arithmetic number, because the mean of its divisors is an integer number (1618825272).

Almost surely, 2^6451494563 is an apocalyptic number.

6451494563 is a deficient number, since it is larger than the sum of its proper divisors (23806525).

6451494563 is a wasteful number, since it uses less digits than its factorization.

6451494563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23806524.

The product of its digits is 1555200, while the sum is 47.

The square root of 6451494563 is about 80321.1962249069. The cubic root of 6451494563 is about 1861.6017499928.

The spelling of 6451494563 in words is "six billion, four hundred fifty-one million, four hundred ninety-four thousand, five hundred sixty-three".