81650014047 has 48 divisors (see below), whose sum is σ = 137393867520. Its totient is φ = 45762990336.

The previous prime is 81650014013. The next prime is 81650014057. The reversal of 81650014047 is 74041005618.

It is a happy number.

81650014047 is a `hidden beast` number, since 8 + 1 + 6 + 500 + 140 + 4 + 7 = 666.

It is not a de Polignac number, because 81650014047 - 2¹⁶ = 81649948511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81650014057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 670663 + ... + 782999.

It is an arithmetic number, because the mean of its divisors is an integer number (2862372240).

Almost surely, 2^81650014047 is an apocalyptic number.

81650014047 is a deficient number, since it is larger than the sum of its proper divisors (55743853473).

81650014047 is a wasteful number, since it uses less digits than its factorization.

81650014047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112572 (or 112569 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 81650014047 in words is "eighty-one billion, six hundred fifty million, fourteen thousand, forty-seven".