51445320111 has 24 divisors (see below), whose sum is σ = 74639818656. Its totient is φ = 34144830720.

The previous prime is 51445320107. The next prime is 51445320131. The reversal of 51445320111 is 11102354415.

51445320111 is a `hidden beast` number, since 5 + 1 + 4 + 453 + 201 + 1 + 1 = 666.

It is not a de Polignac number, because 51445320111 - 2² = 51445320107 is a prime.

It is a super-2 number, since 2×51445320111² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51445320131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3084651 + ... + 3101283.

It is an arithmetic number, because the mean of its divisors is an integer number (3109992444).

Almost surely, 2^51445320111 is an apocalyptic number.

51445320111 is a deficient number, since it is larger than the sum of its proper divisors (23194498545).

51445320111 is a wasteful number, since it uses less digits than its factorization.

51445320111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18143 (or 18140 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 51445320111 its reverse (11102354415), we get a palindrome (62547674526).

The spelling of 51445320111 in words is "fifty-one billion, four hundred forty-five million, three hundred twenty thousand, one hundred eleven".