81153266 has 8 divisors (see below), whose sum is σ = 121768704. Its totient is φ = 40563700.

The previous prime is 81153263. The next prime is 81153277. The reversal of 81153266 is 66235118.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81153263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6911 + ... + 14493.

It is an arithmetic number, because the mean of its divisors is an integer number (15221088).

Almost surely, 2^81153266 is an apocalyptic number.

81153266 is a deficient number, since it is larger than the sum of its proper divisors (40615438).

81153266 is a wasteful number, since it uses less digits than its factorization.

81153266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12936.

The product of its digits is 8640, while the sum is 32.

The square root of 81153266 is about 9008.5107537262. The cubic root of 81153266 is about 432.9475976957.

The spelling of 81153266 in words is "eighty-one million, one hundred fifty-three thousand, two hundred sixty-six".