51654247681 has 8 divisors (see below), whose sum is σ = 51741886304. Its totient is φ = 51566647680.

The previous prime is 51654247621. The next prime is 51654247693. The reversal of 51654247681 is 18674245615.

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

It is a cyclic number.

It is not a de Polignac number, because 51654247681 - 2¹³ = 51654239489 is a prime.

It is a super-2 number, since 2×51654247681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51654247621) 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, 4040806 + ... + 4053568.

It is an arithmetic number, because the mean of its divisors is an integer number (6467735788).

Almost surely, 2^51654247681 is an apocalyptic number.

It is an amenable number.

51654247681 is a deficient number, since it is larger than the sum of its proper divisors (87638623).

51654247681 is a wasteful number, since it uses less digits than its factorization.

51654247681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19311.

The product of its digits is 1612800, while the sum is 49.

The spelling of 51654247681 in words is "fifty-one billion, six hundred fifty-four million, two hundred forty-seven thousand, six hundred eighty-one".