645049163 has 4 divisors (see below), whose sum is σ = 703690008. Its totient is φ = 586408320.

The previous prime is 645049123. The next prime is 645049177. The reversal of 645049163 is 361940546.

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 645049163 - 2¹⁶ = 644983627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645049123) 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, 29320406 + ... + 29320427.

It is an arithmetic number, because the mean of its divisors is an integer number (175922502).

Almost surely, 2^645049163 is an apocalyptic number.

645049163 is a deficient number, since it is larger than the sum of its proper divisors (58640845).

645049163 is a wasteful number, since it uses less digits than its factorization.

645049163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58640844.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 645049163 is about 25397.8180755749. The cubic root of 645049163 is about 864.0342113761.

The spelling of 645049163 in words is "six hundred forty-five million, forty-nine thousand, one hundred sixty-three".