81480165 has 32 divisors (see below), whose sum is σ = 140990976. Its totient is φ = 39943680.

The previous prime is 81480149. The next prime is 81480181. The reversal of 81480165 is 56108418.

It is an interprime number because it is at equal distance from previous prime (81480149) and next prime (81480181).

It is not a de Polignac number, because 81480165 - 2⁴ = 81480149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54052 + ... + 55538.

It is an arithmetic number, because the mean of its divisors is an integer number (4405968).

Almost surely, 2^81480165 is an apocalyptic number.

It is an amenable number.

81480165 is a deficient number, since it is larger than the sum of its proper divisors (59510811).

81480165 is a wasteful number, since it uses less digits than its factorization.

81480165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 81480165 is about 9026.6364167391. The cubic root of 81480165 is about 433.5281474468.

The spelling of 81480165 in words is "eighty-one million, four hundred eighty thousand, one hundred sixty-five".