81760155 has 8 divisors (see below), whose sum is σ = 130816272. Its totient is φ = 43605408.

The previous prime is 81760139. The next prime is 81760163. The reversal of 81760155 is 55106718.

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

It is not a de Polignac number, because 81760155 - 2⁴ = 81760139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2725324 + ... + 2725353.

It is an arithmetic number, because the mean of its divisors is an integer number (16352034).

Almost surely, 2^81760155 is an apocalyptic number.

81760155 is a deficient number, since it is larger than the sum of its proper divisors (49056117).

81760155 is a wasteful number, since it uses less digits than its factorization.

81760155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5450685.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 81760155 is about 9042.1322153572. The cubic root of 81760155 is about 434.0241568098.

The spelling of 81760155 in words is "eighty-one million, seven hundred sixty thousand, one hundred fifty-five".