645466552 has 8 divisors (see below), whose sum is σ = 1210249800. Its totient is φ = 322733272.

The previous prime is 645466541. The next prime is 645466553. The reversal of 645466552 is 255664546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 645466499 and 645466508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645466553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40341652 + ... + 40341667.

It is an arithmetic number, because the mean of its divisors is an integer number (151281225).

Almost surely, 2^645466552 is an apocalyptic number.

It is an amenable number.

645466552 is a deficient number, since it is larger than the sum of its proper divisors (564783248).

645466552 is a wasteful number, since it uses less digits than its factorization.

645466552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80683325 (or 80683321 counting only the distinct ones).

The product of its digits is 864000, while the sum is 43.

The square root of 645466552 is about 25406.0337715276. The cubic root of 645466552 is about 864.2205334109.

The spelling of 645466552 in words is "six hundred forty-five million, four hundred sixty-six thousand, five hundred fifty-two".