9491940666 has 32 divisors (see below), whose sum is σ = 22715757120. Its totient is φ = 2920596912.

The previous prime is 9491940593. The next prime is 9491940707. The reversal of 9491940666 is 6660491949.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6759940 + ... + 6761343.

It is an arithmetic number, because the mean of its divisors is an integer number (709867410).

Almost surely, 2^9491940666 is an apocalyptic number.

9491940666 is an abundant number, since it is smaller than the sum of its proper divisors (13223816454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9491940666 is a wasteful number, since it uses less digits than its factorization.

9491940666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13521307 (or 13521301 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 9491940666 is about 97426.5911648355. The cubic root of 9491940666 is about 2117.3127118603.

The spelling of 9491940666 in words is "nine billion, four hundred ninety-one million, nine hundred forty thousand, six hundred sixty-six".