645156343 has 16 divisors (see below), whose sum is σ = 734876800. Its totient is φ = 561466080.

The previous prime is 645156329. The next prime is 645156353. The reversal of 645156343 is 343651546.

It is a cyclic number.

It is not a de Polignac number, because 645156343 - 2¹³ = 645148151 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 (645156353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45928 + ... + 58306.

It is an arithmetic number, because the mean of its divisors is an integer number (45929800).

Almost surely, 2^645156343 is an apocalyptic number.

645156343 is a deficient number, since it is larger than the sum of its proper divisors (89720457).

645156343 is a wasteful number, since it uses less digits than its factorization.

645156343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12622.

The product of its digits is 129600, while the sum is 37.

The square root of 645156343 is about 25399.9280117090. The cubic root of 645156343 is about 864.0820640895.

The spelling of 645156343 in words is "six hundred forty-five million, one hundred fifty-six thousand, three hundred forty-three".