81800487629 has 8 divisors (see below), whose sum is σ = 95475341568. Its totient is φ = 68622901200.

The previous prime is 81800487619. The next prime is 81800487677. The reversal of 81800487629 is 92678400818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-81800487629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81800487619) 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 7 ways as a sum of consecutive naturals, for example, 124316522 + ... + 124317179.

It is an arithmetic number, because the mean of its divisors is an integer number (11934417696).

Almost surely, 2^81800487629 is an apocalyptic number.

It is an amenable number.

81800487629 is a deficient number, since it is larger than the sum of its proper divisors (13674853939).

81800487629 is a wasteful number, since it uses less digits than its factorization.

81800487629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248633755.

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 81800487629 in words is "eighty-one billion, eight hundred million, four hundred eighty-seven thousand, six hundred twenty-nine".