6451662561 has 8 divisors (see below), whose sum is σ = 8603270784. Its totient is φ = 4300581360.

The previous prime is 6451662551. The next prime is 6451662593. The reversal of 6451662561 is 1652661546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6451662561 - 2¹⁴ = 6451646177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6451662521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102246 + ... + 152831.

It is an arithmetic number, because the mean of its divisors is an integer number (1075408848).

Almost surely, 2^6451662561 is an apocalyptic number.

It is an amenable number.

6451662561 is a deficient number, since it is larger than the sum of its proper divisors (2151608223).

6451662561 is a wasteful number, since it uses less digits than its factorization.

6451662561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263511.

The product of its digits is 259200, while the sum is 42.

The square root of 6451662561 is about 80322.2420068066. The cubic root of 6451662561 is about 1861.6179086598.

The spelling of 6451662561 in words is "six billion, four hundred fifty-one million, six hundred sixty-two thousand, five hundred sixty-one".