51648736661 has 8 divisors (see below), whose sum is σ = 52608847104. Its totient is φ = 50692284720.

The previous prime is 51648736639. The next prime is 51648736663. The reversal of 51648736661 is 16663784615.

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 51648736661 - 2⁶ = 51648736597 is a prime.

It is a super-3 number, since 3×51648736661³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51648736663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 886121 + ... + 942606.

It is an arithmetic number, because the mean of its divisors is an integer number (6576105888).

Almost surely, 2^51648736661 is an apocalyptic number.

It is an amenable number.

51648736661 is a deficient number, since it is larger than the sum of its proper divisors (960110443).

51648736661 is a wasteful number, since it uses less digits than its factorization.

51648736661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829251.

The product of its digits is 4354560, while the sum is 53.

The spelling of 51648736661 in words is "fifty-one billion, six hundred forty-eight million, seven hundred thirty-six thousand, six hundred sixty-one".