91473615585857 has 4 divisors (see below), whose sum is σ = 93704679380676. Its totient is φ = 89242551791040.

The previous prime is 91473615585841. The next prime is 91473615585887. The reversal of 91473615585857 is 75858551637419.

It is a Cunningham number, because it is equal to 9564184²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4407715495936 + 87065900089921 = 2099456^2 + 9330911^2 .

It is a cyclic number.

It is not a de Polignac number, because 91473615585857 - 2⁴ = 91473615585841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91473615585827) 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, 1115531897348 + ... + 1115531897429.

It is an arithmetic number, because the mean of its divisors is an integer number (23426169845169).

Almost surely, 2^{91473615585857} is an apocalyptic number.

It is an amenable number.

91473615585857 is a deficient number, since it is larger than the sum of its proper divisors (2231063794819).

91473615585857 is a wasteful number, since it uses less digits than its factorization.

91473615585857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231063794818.

The product of its digits is 1270080000, while the sum is 74.

The spelling of 91473615585857 in words is "ninety-one trillion, four hundred seventy-three billion, six hundred fifteen million, five hundred eighty-five thousand, eight hundred fifty-seven".