51667221020 has 12 divisors (see below), whose sum is σ = 108501164184. Its totient is φ = 20666888400.

The previous prime is 51667221017. The next prime is 51667221107. The reversal of 51667221020 is 2012276615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291680506 + ... + 1291680545.

It is an arithmetic number, because the mean of its divisors is an integer number (9041763682).

Almost surely, 2^51667221020 is an apocalyptic number.

It is an amenable number.

51667221020 is an abundant number, since it is smaller than the sum of its proper divisors (56833943164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51667221020 is a wasteful number, since it uses less digits than its factorization.

51667221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583361060 (or 2583361058 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

Adding to 51667221020 its reverse (2012276615), we get a palindrome (53679497635).

The spelling of 51667221020 in words is "fifty-one billion, six hundred sixty-seven million, two hundred twenty-one thousand, twenty".