91166956397905 has 8 divisors (see below), whose sum is σ = 110718424156032. Its totient is φ = 72054847465968.

The previous prime is 91166956397903. The next prime is 91166956397939. The reversal of 91166956397905 is 50979365966119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91166956397905 - 2¹ = 91166956397903 is a prime.

It is a super-2 number, since 2×91166956397905² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91166956397903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109839706089 + ... + 109839706918.

It is an arithmetic number, because the mean of its divisors is an integer number (13839803019504).

Almost surely, 2^{91166956397905} is an apocalyptic number.

It is an amenable number.

91166956397905 is a deficient number, since it is larger than the sum of its proper divisors (19551467758127).

91166956397905 is a wasteful number, since it uses less digits than its factorization.

91166956397905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219679413095.

The product of its (nonzero) digits is 744017400, while the sum is 76.

The spelling of 91166956397905 in words is "ninety-one trillion, one hundred sixty-six billion, nine hundred fifty-six million, three hundred ninety-seven thousand, nine hundred five".