81650662 has 4 divisors (see below), whose sum is σ = 122475996. Its totient is φ = 40825330.

The previous prime is 81650651. The next prime is 81650663. The reversal of 81650662 is 26605618.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81650663) 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 as a sum of consecutive naturals, namely, 20412664 + ... + 20412667.

It is an arithmetic number, because the mean of its divisors is an integer number (30618999).

Almost surely, 2^81650662 is an apocalyptic number.

81650662 is a deficient number, since it is larger than the sum of its proper divisors (40825334).

81650662 is a wasteful number, since it uses less digits than its factorization.

81650662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40825333.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 81650662 is about 9036.0755862266. The cubic root of 81650662 is about 433.8303222260.

The spelling of 81650662 in words is "eighty-one million, six hundred fifty thousand, six hundred sixty-two".