51091680641 has 4 divisors (see below), whose sum is σ = 51316754352. Its totient is φ = 50866606932.

The previous prime is 51091680593. The next prime is 51091680649. The reversal of 51091680641 is 14608619015.

51091680641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51091680641 - 2³⁴ = 33911811457 is a prime.

It is a super-2 number, since 2×51091680641² (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 (51091680649) 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, 112536515 + ... + 112536968.

It is an arithmetic number, because the mean of its divisors is an integer number (12829188588).

Almost surely, 2^51091680641 is an apocalyptic number.

It is an amenable number.

51091680641 is a deficient number, since it is larger than the sum of its proper divisors (225073711).

51091680641 is a wasteful number, since it uses less digits than its factorization.

51091680641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225073710.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 51091680641 in words is "fifty-one billion, ninety-one million, six hundred eighty thousand, six hundred forty-one".