91970665201081 has 4 divisors (see below), whose sum is σ = 91983479847412. Its totient is φ = 91957850554752.

The previous prime is 91970665201027. The next prime is 91970665201099. The reversal of 91970665201081 is 18010256607919.

It is a happy number.

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 72118819598400 + 19851845602681 = 8492280^2 + 4455541^2 .

It is a cyclic number.

It is not a de Polignac number, because 91970665201081 - 2²⁹ = 91970128330169 is a prime.

It is a super-3 number, since 3×91970665201081³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91970665202081) 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, 6407312400 + ... + 6407326753.

It is an arithmetic number, because the mean of its divisors is an integer number (22995869961853).

Almost surely, 2^{91970665201081} is an apocalyptic number.

It is an amenable number.

91970665201081 is a deficient number, since it is larger than the sum of its proper divisors (12814646331).

91970665201081 is a wasteful number, since it uses less digits than its factorization.

91970665201081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12814646330.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 91970665201081 in words is "ninety-one trillion, nine hundred seventy billion, six hundred sixty-five million, two hundred one thousand, eighty-one".