81966703 has 16 divisors (see below), whose sum is σ = 106193920. Its totient is φ = 61438176.

The previous prime is 81966701. The next prime is 81966739. The reversal of 81966703 is 30766918.

It is a cyclic number.

It is not a de Polignac number, because 81966703 - 2¹ = 81966701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81966701) 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, 21975 + ... + 25432.

It is an arithmetic number, because the mean of its divisors is an integer number (6637120).

Almost surely, 2^81966703 is an apocalyptic number.

81966703 is a deficient number, since it is larger than the sum of its proper divisors (24227217).

81966703 is a wasteful number, since it uses less digits than its factorization.

81966703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47446.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 81966703 is about 9053.5464321999. The cubic root of 81966703 is about 434.3893364694.

The spelling of 81966703 in words is "eighty-one million, nine hundred sixty-six thousand, seven hundred three".