91608188090 has 32 divisors (see below), whose sum is σ = 166614824016. Its totient is φ = 36262051840.

The previous prime is 91608188069. The next prime is 91608188093. The reversal of 91608188090 is 9088180619.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 14392560961 + 77215627129 = 119969^2 + 277877^2 .

It is not an unprimeable number, because it can be changed into a prime (91608188093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661094 + ... + 787566.

Almost surely, 2^91608188090 is an apocalyptic number.

91608188090 is a deficient number, since it is larger than the sum of its proper divisors (75006635926).

91608188090 is a wasteful number, since it uses less digits than its factorization.

91608188090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127234.

The product of its (nonzero) digits is 248832, while the sum is 50.

The spelling of 91608188090 in words is "ninety-one billion, six hundred eight million, one hundred eighty-eight thousand, ninety".