646625145 has 16 divisors (see below), whose sum is σ = 1059835392. Its totient is φ = 336455040.

The previous prime is 646625143. The next prime is 646625179. The reversal of 646625145 is 541526646.

It is not a de Polignac number, because 646625145 - 2¹ = 646625143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646625143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525097 + ... + 526326.

It is an arithmetic number, because the mean of its divisors is an integer number (66239712).

Almost surely, 2^646625145 is an apocalyptic number.

It is an amenable number.

646625145 is a deficient number, since it is larger than the sum of its proper divisors (413210247).

646625145 is a wasteful number, since it uses less digits than its factorization.

646625145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051472.

The product of its digits is 172800, while the sum is 39.

The square root of 646625145 is about 25428.8250809981. The cubic root of 646625145 is about 864.7373076032.

The spelling of 646625145 in words is "six hundred forty-six million, six hundred twenty-five thousand, one hundred forty-five".