645610522 has 8 divisors (see below), whose sum is σ = 971114400. Its totient is φ = 321905724.

The previous prime is 645610507. The next prime is 645610523. The reversal of 645610522 is 225016546.

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

It is a super-2 number, since 2×645610522² = 833625892234224968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645610523) 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, 448872 + ... + 450307.

It is an arithmetic number, because the mean of its divisors is an integer number (121389300).

Almost surely, 2^645610522 is an apocalyptic number.

645610522 is a deficient number, since it is larger than the sum of its proper divisors (325503878).

645610522 is a wasteful number, since it uses less digits than its factorization.

645610522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899540.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 645610522 is about 25408.8669955982. The cubic root of 645610522 is about 864.2847828443.

The spelling of 645610522 in words is "six hundred forty-five million, six hundred ten thousand, five hundred twenty-two".