916661691864 has 128 divisors (see below), whose sum is σ = 2813284224000. Its totient is φ = 275076628992.

The previous prime is 916661691859. The next prime is 916661691901. The reversal of 916661691864 is 468196166619.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5342404 + ... + 5511315.

It is an arithmetic number, because the mean of its divisors is an integer number (21978783000).

Almost surely, 2^916661691864 is an apocalyptic number.

It is an amenable number.

916661691864 is an abundant number, since it is smaller than the sum of its proper divisors (1896622532136).

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

916661691864 is a wasteful number, since it uses less digits than its factorization.

916661691864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10853774 (or 10853764 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The spelling of 916661691864 in words is "nine hundred sixteen billion, six hundred sixty-one million, six hundred ninety-one thousand, eight hundred sixty-four".