91701678161 has 4 divisors (see below), whose sum is σ = 91772382372. Its totient is φ = 91630973952.

The previous prime is 91701678143. The next prime is 91701678191. The reversal of 91701678161 is 16187610719.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16187610719 = 7 ⋅2312515817.

It can be written as a sum of positive squares in 2 ways, for example, as 85764051025 + 5937627136 = 292855^2 + 77056^2 .

It is a cyclic number.

It is not a de Polignac number, because 91701678161 - 2⁶ = 91701678097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91701678191) 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, 35350160 + ... + 35352753.

It is an arithmetic number, because the mean of its divisors is an integer number (22943095593).

Almost surely, 2^91701678161 is an apocalyptic number.

It is an amenable number.

91701678161 is a deficient number, since it is larger than the sum of its proper divisors (70704211).

91701678161 is a wasteful number, since it uses less digits than its factorization.

91701678161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70704210.

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 91701678161 in words is "ninety-one billion, seven hundred one million, six hundred seventy-eight thousand, one hundred sixty-one".