81066950 has 48 divisors (see below), whose sum is σ = 158695200. Its totient is φ = 30750720.

The previous prime is 81066949. The next prime is 81066959. The reversal of 81066950 is 5966018.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81066950.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81066959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180326 + ... + 180774.

It is an arithmetic number, because the mean of its divisors is an integer number (3306150).

Almost surely, 2^81066950 is an apocalyptic number.

81066950 is a deficient number, since it is larger than the sum of its proper divisors (77628250).

81066950 is a wasteful number, since it uses less digits than its factorization.

81066950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 81066950 is about 9003.7186761915. The cubic root of 81066950 is about 432.7940464227.

The spelling of 81066950 in words is "eighty-one million, sixty-six thousand, nine hundred fifty".