645626546 has 4 divisors (see below), whose sum is σ = 968439822. Its totient is φ = 322813272.

The previous prime is 645626521. The next prime is 645626573.

It is a happy number.

645626546 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 645414025 + 212521 = 25405^2 + 461^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645626497 and 645626506.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161406635 + ... + 161406638.

Almost surely, 2^645626546 is an apocalyptic number.

645626546 is a deficient number, since it is larger than the sum of its proper divisors (322813276).

645626546 is a wasteful number, since it uses less digits than its factorization.

645626546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322813275.

The product of its digits is 1036800, while the sum is 44.

The square root of 645626546 is about 25409.1823166351. The cubic root of 645626546 is about 864.2919332775.

The spelling of 645626546 in words is "six hundred forty-five million, six hundred twenty-six thousand, five hundred forty-six".