91850020669 has 4 divisors (see below), whose sum is σ = 100200022560. Its totient is φ = 83500018780.

The previous prime is 91850020573. The next prime is 91850020693. The reversal of 91850020669 is 96602005819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91850020669 - 2¹⁷ = 91849889597 is a prime.

It is a super-2 number, since 2×91850020669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91850030669) 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, 4175000929 + ... + 4175000950.

It is an arithmetic number, because the mean of its divisors is an integer number (25050005640).

Almost surely, 2^91850020669 is an apocalyptic number.

It is an amenable number.

91850020669 is a deficient number, since it is larger than the sum of its proper divisors (8350001891).

91850020669 is a wasteful number, since it uses less digits than its factorization.

91850020669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8350001890.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 91850020669 in words is "ninety-one billion, eight hundred fifty million, twenty thousand, six hundred sixty-nine".