645583741 has 8 divisors (see below), whose sum is σ = 708166368. Its totient is φ = 583650000.

The previous prime is 645583699. The next prime is 645583753. The reversal of 645583741 is 147385546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645583741 - 2¹¹ = 645581693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645523741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160135 + ... + 164116.

It is an arithmetic number, because the mean of its divisors is an integer number (88520796).

Almost surely, 2^645583741 is an apocalyptic number.

It is an amenable number.

645583741 is a deficient number, since it is larger than the sum of its proper divisors (62582627).

645583741 is a wasteful number, since it uses less digits than its factorization.

645583741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324443.

The product of its digits is 403200, while the sum is 43.

The square root of 645583741 is about 25408.3399890666. The cubic root of 645583741 is about 864.2728320215.

The spelling of 645583741 in words is "six hundred forty-five million, five hundred eighty-three thousand, seven hundred forty-one".