91566159120 has 60 divisors (see below), whose sum is σ = 307509686796. Its totient is φ = 24417642240.

The previous prime is 91566159103. The next prime is 91566159121. The reversal of 91566159120 is 2195166519.

It is a happy number.

91566159120 is a `hidden beast` number, since 9 + 1 + 5 + 6 + 615 + 9 + 1 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61173118224 + 30393040896 = 247332^2 + 174336^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×91566159120² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (91566159121) 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, 63586891 + ... + 63588330.

Almost surely, 2^91566159120 is an apocalyptic number.

91566159120 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91566159120 is an abundant number, since it is smaller than the sum of its proper divisors (215943527676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91566159120 is a wasteful number, since it uses less digits than its factorization.

91566159120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127175240 (or 127175231 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The spelling of 91566159120 in words is "ninety-one billion, five hundred sixty-six million, one hundred fifty-nine thousand, one hundred twenty".