91685001669 has 24 divisors (see below), whose sum is σ = 127312450560. Its totient is φ = 58685618880.

The previous prime is 91685001587. The next prime is 91685001677. The reversal of 91685001669 is 96610058619.

It is not a de Polignac number, because 91685001669 - 2⁸ = 91685001413 is a prime.

It is a super-2 number, since 2×91685001669² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91685001689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240937 + ... + 491345.

It is an arithmetic number, because the mean of its divisors is an integer number (5304685440).

Almost surely, 2^91685001669 is an apocalyptic number.

It is an amenable number.

91685001669 is a deficient number, since it is larger than the sum of its proper divisors (35627448891).

91685001669 is a wasteful number, since it uses less digits than its factorization.

91685001669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250601 (or 250570 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 91685001669 in words is "ninety-one billion, six hundred eighty-five million, one thousand, six hundred sixty-nine".