91896567305621 has 16 divisors (see below), whose sum is σ = 101383278366720. Its totient is φ = 82755409553280.

The previous prime is 91896567305591. The next prime is 91896567305623. The reversal of 91896567305621 is 12650376569819.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91896567305621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91896567305623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10382876 + ... + 17076218.

It is an arithmetic number, because the mean of its divisors is an integer number (6336454897920).

Almost surely, 2^{91896567305621} is an apocalyptic number.

It is an amenable number.

91896567305621 is a deficient number, since it is larger than the sum of its proper divisors (9486711061099).

91896567305621 is a wasteful number, since it uses less digits than its factorization.

91896567305621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6719156.

The product of its (nonzero) digits is 146966400, while the sum is 68.

The spelling of 91896567305621 in words is "ninety-one trillion, eight hundred ninety-six billion, five hundred sixty-seven million, three hundred five thousand, six hundred twenty-one".