645611463 has 24 divisors (see below), whose sum is σ = 1079270400. Its totient is φ = 364248144.

The previous prime is 645611413. The next prime is 645611467. The reversal of 645611463 is 364116546.

It is a happy number.

645611463 is a `hidden beast` number, since 645 + 6 + 1 + 1 + 4 + 6 + 3 = 666.

It is not a de Polignac number, because 645611463 - 2¹⁰ = 645610439 is a prime.

It is a super-2 number, since 2×645611463² = 833628322314000738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645611467) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59883 + ... + 69836.

It is an arithmetic number, because the mean of its divisors is an integer number (44969600).

Almost surely, 2^645611463 is an apocalyptic number.

645611463 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

645611463 is a deficient number, since it is larger than the sum of its proper divisors (433658937).

645611463 is a wasteful number, since it uses less digits than its factorization.

645611463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129811 (or 129808 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 645611463 is about 25408.8855127493. The cubic root of 645611463 is about 864.2852027526.

The spelling of 645611463 in words is "six hundred forty-five million, six hundred eleven thousand, four hundred sixty-three".