645570463 has 8 divisors (see below), whose sum is σ = 682868448. Its totient is φ = 609041664.

The previous prime is 645570449. The next prime is 645570473. The reversal of 645570463 is 364075546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645570463 is a prime.

It is a super-2 number, since 2×645570463² = 833522445396068738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645570403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190570 + ... + 193927.

It is an arithmetic number, because the mean of its divisors is an integer number (85358556).

Almost surely, 2^645570463 is an apocalyptic number.

645570463 is a deficient number, since it is larger than the sum of its proper divisors (37297985).

645570463 is a wasteful number, since it uses less digits than its factorization.

645570463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384593.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 645570463 is about 25408.0786955645. The cubic root of 645570463 is about 864.2669066898.

The spelling of 645570463 in words is "six hundred forty-five million, five hundred seventy thousand, four hundred sixty-three".