51064644261 has 8 divisors (see below), whose sum is σ = 68099565600. Its totient is φ = 34036409552.

The previous prime is 51064644247. The next prime is 51064644311. The reversal of 51064644261 is 16244646015.

51064644261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51064644261 - 2¹⁴ = 51064627877 is a prime.

It is a super-2 number, since 2×51064644261² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51064643261) 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, 1653810 + ... + 1684403.

It is an arithmetic number, because the mean of its divisors is an integer number (8512445700).

Almost surely, 2^51064644261 is an apocalyptic number.

It is an amenable number.

51064644261 is a deficient number, since it is larger than the sum of its proper divisors (17034921339).

51064644261 is a wasteful number, since it uses less digits than its factorization.

51064644261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343315.

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 51064644261 in words is "fifty-one billion, sixty-four million, six hundred forty-four thousand, two hundred sixty-one".