51199145481 has 16 divisors (see below), whose sum is σ = 74928372480. Its totient is φ = 30839415120.

The previous prime is 51199145449. The next prime is 51199145483. The reversal of 51199145481 is 18454199115.

It is not a de Polignac number, because 51199145481 - 2⁵ = 51199145449 is a prime.

It is a super-2 number, since 2×51199145481² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51199145481.

It is not an unprimeable number, because it can be changed into a prime (51199145483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4753791 + ... + 4764548.

It is an arithmetic number, because the mean of its divisors is an integer number (4683023280).

Almost surely, 2^51199145481 is an apocalyptic number.

It is an amenable number.

51199145481 is a deficient number, since it is larger than the sum of its proper divisors (23729226999).

51199145481 is a wasteful number, since it uses less digits than its factorization.

51199145481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9518516.

The product of its digits is 259200, while the sum is 48.

The spelling of 51199145481 in words is "fifty-one billion, one hundred ninety-nine million, one hundred forty-five thousand, four hundred eighty-one".