81495254177 has 8 divisors (see below), whose sum is σ = 89072612352. Its totient is φ = 74227176000.

The previous prime is 81495254131. The next prime is 81495254219. The reversal of 81495254177 is 77145259418.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81495254177 - 2²² = 81491059873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81495254977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77319449 + ... + 77320502.

It is an arithmetic number, because the mean of its divisors is an integer number (11134076544).

Almost surely, 2^81495254177 is an apocalyptic number.

It is an amenable number.

81495254177 is a deficient number, since it is larger than the sum of its proper divisors (7577358175).

81495254177 is a wasteful number, since it uses less digits than its factorization.

81495254177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154639999.

The product of its digits is 2822400, while the sum is 53.

The spelling of 81495254177 in words is "eighty-one billion, four hundred ninety-five million, two hundred fifty-four thousand, one hundred seventy-seven".