81662948005177 has 12 divisors (see below), whose sum is σ = 102584860305088. Its totient is φ = 63633465977400.

The previous prime is 81662948005169. The next prime is 81662948005189. The reversal of 81662948005177 is 77150084926618.

It is not a de Polignac number, because 81662948005177 - 2³ = 81662948005169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81662948005147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48207170349 + ... + 48207172042.

Almost surely, 2^{81662948005177} is an apocalyptic number.

It is an amenable number.

81662948005177 is a deficient number, since it is larger than the sum of its proper divisors (20921912299911).

81662948005177 is a wasteful number, since it uses less digits than its factorization.

81662948005177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96414342420 (or 96414342409 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 64.

The spelling of 81662948005177 in words is "eighty-one trillion, six hundred sixty-two billion, nine hundred forty-eight million, five thousand, one hundred seventy-seven".