91656385401 has 32 divisors (see below), whose sum is σ = 140142539520. Its totient is φ = 52196880384.

The previous prime is 91656385367. The next prime is 91656385409. The reversal of 91656385401 is 10458365619.

It is not a de Polignac number, because 91656385401 - 2¹⁰ = 91656384377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91656385409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23786391 + ... + 23790243.

It is an arithmetic number, because the mean of its divisors is an integer number (4379454360).

Almost surely, 2^91656385401 is an apocalyptic number.

91656385401 is the 161826-th nonagonal number.

It is an amenable number.

91656385401 is a deficient number, since it is larger than the sum of its proper divisors (48486154119).

91656385401 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (91656385400) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (7425).

91656385401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7425.

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 91656385401 in words is "ninety-one billion, six hundred fifty-six million, three hundred eighty-five thousand, four hundred one".