51649622801 has 4 divisors (see below), whose sum is σ = 59028140352. Its totient is φ = 44271105252.

The previous prime is 51649622797. The next prime is 51649622803. The reversal of 51649622801 is 10822694615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51649622801 - 2² = 51649622797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51649622803) 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, 3689258765 + ... + 3689258778.

It is an arithmetic number, because the mean of its divisors is an integer number (14757035088).

Almost surely, 2^51649622801 is an apocalyptic number.

It is an amenable number.

51649622801 is a deficient number, since it is larger than the sum of its proper divisors (7378517551).

51649622801 is an equidigital number, since it uses as much as digits as its factorization.

51649622801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378517550.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 51649622801 in words is "fifty-one billion, six hundred forty-nine million, six hundred twenty-two thousand, eight hundred one".