51650774581 has 8 divisors (see below), whose sum is σ = 59329100160. Its totient is φ = 44047359888.

The previous prime is 51650774543. The next prime is 51650774633. The reversal of 51650774581 is 18547705615.

It is a happy number.

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

It is not a de Polignac number, because 51650774581 - 2⁹ = 51650774069 is a prime.

It is a super-2 number, since 2×51650774581² (a number of 22 digits) contains 22 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 (51650774531) 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, 18726241 + ... + 18728998.

It is an arithmetic number, because the mean of its divisors is an integer number (7416137520).

Almost surely, 2^51650774581 is an apocalyptic number.

It is an amenable number.

51650774581 is a deficient number, since it is larger than the sum of its proper divisors (7678325579).

51650774581 is a wasteful number, since it uses less digits than its factorization.

51650774581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37455443.

The product of its (nonzero) digits is 1176000, while the sum is 49.

The spelling of 51650774581 in words is "fifty-one billion, six hundred fifty million, seven hundred seventy-four thousand, five hundred eighty-one".