81758437754 has 12 divisors (see below), whose sum is σ = 142660131354. Its totient is φ = 35039330424.

The previous prime is 81758437753. The next prime is 81758437757. The reversal of 81758437754 is 45773485718.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 46970592529 + 34787845225 = 216727^2 + 186515^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81758437693 and 81758437702.

It is not an unprimeable number, because it can be changed into a prime (81758437753) 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 5 ways as a sum of consecutive naturals, for example, 417134789 + ... + 417134984.

Almost surely, 2^81758437754 is an apocalyptic number.

81758437754 is a deficient number, since it is larger than the sum of its proper divisors (60901693600).

81758437754 is a wasteful number, since it uses less digits than its factorization.

81758437754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834269789 (or 834269782 counting only the distinct ones).

The product of its digits is 26342400, while the sum is 59.

The spelling of 81758437754 in words is "eighty-one billion, seven hundred fifty-eight million, four hundred thirty-seven thousand, seven hundred fifty-four".