645562607 has 4 divisors (see below), whose sum is σ = 683536896. Its totient is φ = 607588320.

The previous prime is 645562571. The next prime is 645562613. The reversal of 645562607 is 706265546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645562607 - 2⁶ = 645562543 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 (645562667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18987119 + ... + 18987152.

It is an arithmetic number, because the mean of its divisors is an integer number (170884224).

Almost surely, 2^645562607 is an apocalyptic number.

645562607 is a deficient number, since it is larger than the sum of its proper divisors (37974289).

645562607 is a wasteful number, since it uses less digits than its factorization.

645562607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37974288.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 645562607 is about 25407.9240985957. The cubic root of 645562607 is about 864.2634008973.

The spelling of 645562607 in words is "six hundred forty-five million, five hundred sixty-two thousand, six hundred seven".