51669381481 has 9 divisors (see below), whose sum is σ = 54019015869. Its totient is φ = 49417885836.

The previous prime is 51669381473. The next prime is 51669381493. The reversal of 51669381481 is 18418396615.

The square root of 51669381481 is 227309.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 51669381481 - 2³ = 51669381473 is a prime.

It is a super-2 number, since 2×51669381481² (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 (51669381431) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 5223166 + ... + 5233048.

Almost surely, 2^51669381481 is an apocalyptic number.

51669381481 is the 227309-th square number.

51669381481 is the 113655-th centered octagonal number.

It is an amenable number.

51669381481 is a deficient number, since it is larger than the sum of its proper divisors (2349634388).

51669381481 is an frugal number, since it uses more digits than its factorization.

51669381481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19812 (or 9906 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 52.

The spelling of 51669381481 in words is "fifty-one billion, six hundred sixty-nine million, three hundred eighty-one thousand, four hundred eighty-one".