81051662 has 8 divisors (see below), whose sum is σ = 121632192. Its totient is φ = 40507600.

The previous prime is 81051661. The next prime is 81051667. The reversal of 81051662 is 26615018.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81051661) 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, 2639 + ... + 13002.

It is an arithmetic number, because the mean of its divisors is an integer number (15204024).

Almost surely, 2^81051662 is an apocalyptic number.

81051662 is a deficient number, since it is larger than the sum of its proper divisors (40580530).

81051662 is a wasteful number, since it uses less digits than its factorization.

81051662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18234.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81051662 is about 9002.8696536160. The cubic root of 81051662 is about 432.7668385763.

The spelling of 81051662 in words is "eighty-one million, fifty-one thousand, six hundred sixty-two".