51369243666 has 16 divisors (see below), whose sum is σ = 110641448064. Its totient is φ = 15805921104.

The previous prime is 51369243659. The next prime is 51369243683. The reversal of 51369243666 is 66634296315.

It is a super-2 number, since 2×51369243666² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329289946 + ... + 329290101.

It is an arithmetic number, because the mean of its divisors is an integer number (6915090504).

Almost surely, 2^51369243666 is an apocalyptic number.

51369243666 is an abundant number, since it is smaller than the sum of its proper divisors (59272204398).

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

51369243666 is a wasteful number, since it uses less digits than its factorization.

51369243666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658580065.

The product of its digits is 4199040, while the sum is 51.

The spelling of 51369243666 in words is "fifty-one billion, three hundred sixty-nine million, two hundred forty-three thousand, six hundred sixty-six".