81503783154 has 24 divisors (see below), whose sum is σ = 176622198012. Its totient is φ = 27163209600.

The previous prime is 81503783147. The next prime is 81503783159. The reversal of 81503783154 is 45138730518.

It is a happy number.

81503783154 is a `hidden beast` number, since 81 + 50 + 378 + 3 + 154 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 81295125129 + 208658025 = 285123^2 + 14445^2 .

It is not an unprimeable number, because it can be changed into a prime (81503783159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285859 + ... + 494694.

Almost surely, 2^81503783154 is an apocalyptic number.

81503783154 is an abundant number, since it is smaller than the sum of its proper divisors (95118414858).

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

81503783154 is a wasteful number, since it uses less digits than its factorization.

81503783154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786362 (or 786359 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 81503783154 in words is "eighty-one billion, five hundred three million, seven hundred eighty-three thousand, one hundred fifty-four".