51676393221 has 12 divisors (see below), whose sum is σ = 74698062348. Its totient is φ = 34425828864.

The previous prime is 51676393183. The next prime is 51676393247. The reversal of 51676393221 is 12239367615.

51676393221 is a `hidden beast` number, since 5 + 1 + 6 + 7 + 639 + 3 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49965660900 + 1710732321 = 223530^2 + 41361^2 .

It is not a de Polignac number, because 51676393221 - 2¹³ = 51676385029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51676393271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2078620 + ... + 2103333.

It is an arithmetic number, because the mean of its divisors is an integer number (6224838529).

Almost surely, 2^51676393221 is an apocalyptic number.

It is an amenable number.

51676393221 is a deficient number, since it is larger than the sum of its proper divisors (23021669127).

51676393221 is a wasteful number, since it uses less digits than its factorization.

51676393221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4183332 (or 4183329 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The spelling of 51676393221 in words is "fifty-one billion, six hundred seventy-six million, three hundred ninety-three thousand, two hundred twenty-one".