645761607 has 8 divisors (see below), whose sum is σ = 906332160. Its totient is φ = 407849400.

The previous prime is 645761581. The next prime is 645761657. The reversal of 645761607 is 706167546.

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

It is not a de Polignac number, because 645761607 - 2⁸ = 645761351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645761657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5664519 + ... + 5664632.

It is an arithmetic number, because the mean of its divisors is an integer number (113291520).

Almost surely, 2^645761607 is an apocalyptic number.

645761607 is a deficient number, since it is larger than the sum of its proper divisors (260570553).

645761607 is a wasteful number, since it uses less digits than its factorization.

645761607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11329173.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 645761607 is about 25411.8398979688. The cubic root of 645761607 is about 864.3521972152.

The spelling of 645761607 in words is "six hundred forty-five million, seven hundred sixty-one thousand, six hundred seven".