91115882821661 has 8 divisors (see below), whose sum is σ = 91151170039104. Its totient is φ = 91080602252640.

The previous prime is 91115882821637. The next prime is 91115882821723. The reversal of 91115882821661 is 16612828851119.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91115882821661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91115882821661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91115882811661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25841006 + ... + 29154576.

It is an arithmetic number, because the mean of its divisors is an integer number (11393896254888).

Almost surely, 2^{91115882821661} is an apocalyptic number.

It is an amenable number.

91115882821661 is a deficient number, since it is larger than the sum of its proper divisors (35287217443).

91115882821661 is a wasteful number, since it uses less digits than its factorization.

91115882821661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324211.

The product of its digits is 3317760, while the sum is 59.

The spelling of 91115882821661 in words is "ninety-one trillion, one hundred fifteen billion, eight hundred eighty-two million, eight hundred twenty-one thousand, six hundred sixty-one".