645011361 has 6 divisors (see below), whose sum is σ = 931683090. Its totient is φ = 430007568.

The previous prime is 645011347. The next prime is 645011363. The reversal of 645011361 is 163110546.

645011361 is a `hidden beast` number, since 645 + 0 + 1 + 13 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 568536336 + 76475025 = 23844^2 + 8745^2 .

It is not a de Polignac number, because 645011361 - 2⁷ = 645011233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645011363) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35833956 + ... + 35833973.

It is an arithmetic number, because the mean of its divisors is an integer number (155280515).

Almost surely, 2^645011361 is an apocalyptic number.

It is an amenable number.

645011361 is a deficient number, since it is larger than the sum of its proper divisors (286671729).

645011361 is a wasteful number, since it uses less digits than its factorization.

645011361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71667935 (or 71667932 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 645011361 is about 25397.0738668847. The cubic root of 645011361 is about 864.0173326320.

The spelling of 645011361 in words is "six hundred forty-five million, eleven thousand, three hundred sixty-one".