645737716 has 24 divisors (see below), whose sum is σ = 1221484544. Its totient is φ = 296926560.

The previous prime is 645737711. The next prime is 645737717. The reversal of 645737716 is 617737546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645737711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8820 + ... + 37003.

Almost surely, 2^645737716 is an apocalyptic number.

It is an amenable number.

645737716 is a deficient number, since it is larger than the sum of its proper divisors (575746828).

645737716 is a wasteful number, since it uses less digits than its factorization.

645737716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46111 (or 46109 counting only the distinct ones).

The product of its digits is 740880, while the sum is 46.

The square root of 645737716 is about 25411.3698174656. The cubic root of 645737716 is about 864.3415377124.

The spelling of 645737716 in words is "six hundred forty-five million, seven hundred thirty-seven thousand, seven hundred sixteen".