645186696 has 128 divisors (see below), whose sum is σ = 2030054400. Its totient is φ = 165991680.

The previous prime is 645186683. The next prime is 645186697. The reversal of 645186696 is 696681546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (645186697) 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, 199831 + ... + 203033.

It is an arithmetic number, because the mean of its divisors is an integer number (15859800).

Almost surely, 2^645186696 is an apocalyptic number.

645186696 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645186696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015027200).

645186696 is an abundant number, since it is smaller than the sum of its proper divisors (1384867704).

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

645186696 is a wasteful number, since it uses less digits than its factorization.

645186696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339 (or 3335 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The square root of 645186696 is about 25400.5255063749. The cubic root of 645186696 is about 864.0956148470.

The spelling of 645186696 in words is "six hundred forty-five million, one hundred eighty-six thousand, six hundred ninety-six".